Abstract: Methods and systems for a content server to select sets of video streams having different encoding parameters for transmitting the sets of video streams to a media device are disclosed herein. In some embodiments, a method for transmitting video streams for a media program from a server to a media device includes: selecting, by the server, first encoding parameters including a first bitrate for a first set of video streams for the media program based on a first estimated bandwidth capacity for a network linking the server and the media device, transmitting the first set of video streams from the server to the media device, determining, by the server, second encoding parameters including a second bitrate for a second set of video streams for the media program, and transmitting the second set of video streams from the server to the media device.

Abstract: In one embodiment, a method includes retrieving a previous communication associated with a user on an online social network, the previous communication having been made on a date in the past; calculating a distribution-probability score for the previous communication reflecting a probability that the previous communication will be shared on the online social network by the user; and sending the previous communication to the user, wherein the distribution-probability score for the previous communication satisfies a threshold.

Abstract: In one embodiment, a method includes retrieving a previous communication associated with a user on an online social network, the previous communication having been made on a date in the past; calculating a distribution-probability score for the previous communication reflecting a probability that the previous communication will be shared on the online social network by the user; and sending the previous communication to the user, wherein the distribution-probability score for the previous communication satisfies a threshold.

Abstract: A computer system receives a request to access a server. The request includes a first device tag set. When the first device tag set matches a previously assigned device tag set, the computer system allows access to the server without requesting full access credentials of a user. The computer system invalidates the first device tag set, and sends a second device tag set. When the first device tag set does not match the previously assigned device tag set, the computer system requests full access credentials from the user.