Abstract: In one embodiment, a method includes receiving, from beacons of a third-party (e.g., a business), session information for a user of an online social network. A mobile device of the user may have been in at least one wireless communication session with at least one beacon, and during the session the mobile device was proximate to the at least one beacon. The session information may include an identifier for the user, which may be used to access social-networking information for the user. Session information and the social-networking information of the user may be sent back to the third-party. User-specified permissions may delimit which information may be sent.

Abstract: An online system maintains a web page associated with one or more page administrators. The online system trains a machine learning model to determine a likelihood of a page administrator account accepting a request for the online system to present content about the web page to other users of the online system. The model uses features extracted from data about the page administrator accounts on the online system, the page administrator interactions with the online system, and the web page. The online system selects one or more page administrator accounts and sends them requests based on the determined likelihood scores. The online system delivers content associated with the web page to users of the online system based on a response to the request.

Abstract: The present disclosure is directed toward systems and methods for providing a start trigger for a live video broadcast. In particular, in some embodiments the systems and methods described herein provide a live video stream received from a broadcaster client device to one or more viewer client devices. Additionally, the systems and methods described herein determine whether an audience satisfies a triggering event to provide the video stream to an audience of viewers. The systems and methods provide content for a wait screen in response to determining that the audience does not satisfy the triggering event, and provide the video stream in a live broadcast in response to determining that the audience does satisfy the triggering event.

Abstract: In one embodiment, a method includes receiving, from a client system of a first user of an online social network, a request for a user-list, generating a structured query corresponding to the user-list, where the structured query is selected from a plurality of structured queries, and identifying one or more second users of the online social network that match the structured query and have a social connection or non-social connection with the first user. The social connection between the first user and the second user being based on social interactions on the online social network. The non-social connection between the first user and the second user being based on non-social interactions on a third-party application on the client system and being accessed by the online social network from the third-party application. The method includes sending, to the client system, instructions for displaying the user-list to the first user.

Abstract: A content distribution system determines a content selection metric that allows the content distribution system to evaluate whether a content provider maximizes its net content value by stating the true content value of presenting content items by the content distribution system. The content distribution system determines net content values of presented content items and re-performs content selection processes based on modified content value offers. The content distribution system then determines sets of alternative net content values and compares the alternative net content values to the corresponding net content values to determine if the content provider can achieve a greater net content value with a content value offer that does not match the stated content value of presenting the content value. The content distribution system then determines a content selection metric based on the compared net content values and alternative net content values.

Abstract: An online system maintains user interactions with different entities, such as pages, maintained by the online system. The online system also allows an administrator of multiple entities to merge two or more of the entities. When merging entities, the online system allows the administrator to select specific interactions by the administrator with the entities to be merged that are subsequently associated with the entity resulting from the merge. The online system also presents an interface to other users who have interacted with the entities to be merged that allows the users to select individual interactions with the entities to be merged to be associated with the entity resulting from the merge. The interface allowing the user to select the individual interactions may be accessed via a notification sent to the user by the online system.

Abstract: An active matrix display where in one embodiment each cell comprises: a driving circuit for providing current to light emitting devices placed in the cell under the control of a data driver signal, a first light emitting device location connected to the driving circuit and a second light emitting device location connected in series to the first light emitting device location. A first thin-film transistor (TFT) is connected in parallel with the first light emitting device location and a second TFT is connected in parallel with the second light emitting device location, its gate node connected to the gate node of the first TFT. One terminal of a third TFT is connected to the gate nodes of the first and second TFTs and selectively connects a control signal to the first and second TFTs under the control of a scan driver signal. The control signal determines which of a first or second light emitting device placed in the cell emits light when the driving circuit provides current.

Abstract: Examples of a pixel cell are disclosed. In one example, a pixel cell may include a first semiconductor layer including a photodiode and one or more transistor devices configured to convert charges generated by the photodiode into an analog signal. The pixel cell may also include a second semiconductor layer including one or more transistor devices configured to convert the analog signal to one or more digital signals. The first semiconductor layer and the second semiconductor layer may form a stack structure. In another example, a pixel cell may include a photodiode and a capacitor. The pixel cell may be operated, in a first mode of measurement, to measure the charges stored at the capacitor when the capacitor is electrically coupled with the photodiode, and in a second mode of measurement, to measure the charges stored at the capacitor when the capacitor is electrically isolated from the photodiode.

Abstract: A method of posting ephemeral posts is disclosed. The method starts with receiving, from a user of a social network, a request to post an ephemeral post, the request including an ephemeral variable associated with a threshold event. The ephemeral post is posted on behalf of the user. Then an occurrence of the threshold event is monitored. When the threshold event has not occurred, the post is allowed to be accessible to at least one viewer other than the user. When the threshold event has occurred, the post is blocked from being accessible by the at least one view other than the user.

Abstract: The disclosed optical lens assemblies may include a pre-strained deformable element that exhibits a non-uniform mechanical strain or stress profile, a structural support element coupled to the pre-strained deformable element, and a deformable medium positioned between the pre-strained deformable element and the structural support element. Related head-mounted displays and methods of fabricating such optical lens assemblies are also disclosed.

Abstract: A depth measurement assembly (DMA) includes an illumination source that projects pulses of light (e.g., structured light) at a temporal pulsing frequency into a local area. The DMA includes a sensor that capture images of the pulses of light reflected from the local area and determines, using one or more of the captured images, one or more TOF phase shifts for the pulses of light. The DMA includes a controller coupled to the sensor and configured to determine a first set of estimated radial distances to an object in the local area based on the one or more TOF phase shifts. The controller determines a second estimated radial distance to the object based on an encoding of structured light and at least one of the captured images. The controller selects an estimated radial distance from the first set of radial distances.

Abstract: In one embodiment, a method includes identifying one or more place-entity nodes in a heterogeneous graph, wherein the heterogenous graph comprises place-entity nodes, user nodes, and n-gram nodes, and wherein each place-entity node corresponds to a place-entity associated with a particular geographic location, assigning, for each identified place-entity node, an initial quality-score for the place-entity node, and calculating, for each identified place-entity node, a final quality-score for the identified place-entity node, wherein each final quality-score is calculated by iteratively propagating the initial quality-scores corresponding to the identified place-entity nodes, respectively, through the place-entity nodes, n-gram nodes, and user nodes of the heterogeneous graph until the quality-scores associated with the place-entity nodes, n-gram nodes, and user nodes reach convergence.

Abstract: A distortion calibration system generates a distortion map for a head-mounted display (HMD). The system includes a camera that takes pictures of a test pattern displayed by the HMD. The images are taken at different camera positions and/or states of the HMD. The system determines a distortion map using the captured images, and uploads it to the HMD as part of, e.g., an optical model. The HMD comprises an electronic display, an eye tracking unit, an optics block, and a module. The module estimates distortion values based on eye tracking information from the eye tracking unit, an optical model, and a state of the HMD (e.., a distance between the optics block and the electronic display). The module determines an adjusted state of the HMD using the estimated distortion values, the eye tracking information, and the optical model, and adjusts the state of the HMD to the adjusted state.

Abstract: Various client devices include displays and one or more image capture devices configured to capture video data. Different users of an online system may authorize client devices to exchange information captured by their respective image capture devices. A user viewing video data captured by another user's client device identifies an object of interest in the video data to the other user's client device. The other user's client device modifies captured video data so a focal point of the captured video data is the object of interest and so the object of interest is magnified in the captured video data. Subsequently, the modified video data is transmitted to the client device of the user viewing the captured video data.

Abstract: A system comprises a plurality of laser generators, each generating a coherent beam, the plurality of laser generators arranged such that at least two of the generated coherent beams intersect with each other. The system further comprises an anti-refraction prism. The anti-refraction prism has a plurality of incident surfaces. The anti-refraction prism also has an egress surface facing a photosensitive film layer, with the coherent beams interfering within the anti-refraction prism and exiting at the egress surface to create an interference exposure pattern at an exposure region of the photosensitive film layer. Furthermore, the anti-refraction prism has a refraction index within a threshold range of the refraction index of the photosensitive film layer, and wherein the anti-refraction prism reduces a change in angle of each coherent beam in the photosensitive film layer due to refraction.

Abstract: Disclosed are fiber amplifiers with multiple pumping sources including multiple optical sources or an optical comb source with multiple spectral lines. A comb source may include generating a plurality of evenly spaced or nearly evenly spaced spectral lines. The optical comb source may pump a fiber by propagating optical energy at the multiple spectral lines through the fiber. The comb source may cause gain in the fiber at in a band of wavelengths different from the spectral lines of the comb source. A weak signal injected into the fiber that propagates in the fiber will experience optical gain in the fiber producing an amplified signal at the wavelength within a band of wavelengths different from the comb source wavelengths. When the bandwidth of the multiple bands of gain is wide, the amplifier may be referred to as an ultra-wideband amplifier.

Abstract: Embodiments relate to transferring dies or other electronic components from a carrier substrate to a target substrate of a device as part of chip assembly for the device. Bonding material is applied to selected dies on a carrier substrate by direct boning, or to corresponding die transfer locations on a target substrate. The carrier substrate is then brought into contact with the target substrate to transfer each of the selected dies to the carrier substrate. Dies can also be directly bonded to the target substrate even in the presence of other die in situ (e.g., from a previous bonding cycle), hence, enables more than one direct bond cycle to be carried out for a target substrate. As such, multi-color (RGB) display elements can be assembled in stages (e.g., separate bonding cycles) in a flexible manner to provide redundancy or to replace inoperative LED dies.