Abstract: An online system generates a cluster group and uses membership in the cluster group as an eligibility criteria for presenting a content item. The online system receives a request from a third party system to present the content item and an identification of a target action associated with the content item. The online system also receives information about users who performed a target action and users who performed related actions other than the target action on one or more webpages associated with the third party system. The online system forms a multitask neural network and uses the multitask neural network to train a cluster model based on the received information. The online system applies the cluster model to candidate users who have not performed the target action and determines whether to include a candidate user into the cluster group based on output of the cluster model.

Abstract: An online system generates a cluster group and uses membership in the cluster group as an eligibility criteria for presenting a content item. The online system receives a request from a third party system to present the content item. The online system also receives identification information about users who have visited webpages associated with the third party system and descriptive information associated with the webpages. Based on the descriptive information, the online system extracts tags for the webpages and classifies the webpages into one or more categories that include a category associated with the content item. The online system generates a seed group that includes users who visited webpages in the category associated with the content item. The online system further expands the seed group to a cluster group by applying a cluster model to one or more characteristics of each candidate user not included in the seed group.

Abstract: An online system receives one or more aggregation rules associated with a third party system that determine online system users' eligibility for receiving content items provided by the third party system using the online system users' behavior. When an online system user performs actions related to content provided by the third party system via a client device, events describing the actions are generated and communicated from the client device to the online system. The online system evaluates a user's eligibility when a user performs an action by applying an aggregation rule to an event corresponding to the user's action and other events associated with the user corresponding to the user's previous actions. The online system may re-evaluate a user's eligibility at a later time if the user is determined to be ineligible. The online system provides content items to eligible users for presentation.

Abstract: An online system defines a new group of users of the online system for a content provider to use as an audience for its content. The online system generates the audience by first allowing the content provider to specify a subset of the users of the online system, along with a weight for each specified user. The online system then performs a lookalike expansion on the specified subset to obtain a larger group of users of the online system who are similar to the specified subset. This lookalike expansion is weighted using the weights provided for each of the members of the specified subset. Once the resulting expanded audience is generated, the online system performs a content selection process for content to present to users of the online system, where membership in the cluster group is used as an eligibility criteria in the content selection process.

Abstract: Systems, methods, and non-transitory computer readable media are configured to provide a plurality of control modes to selectively control display of content items in a news feed of a user. One or more content items associated with a predetermined entity selected by the user or a predetermined event are identified based on at least one control mode of the plurality of control modes. Display of at least one content item of the one or more content items is provided in the news feed of the user.

Abstract: An online system receives one or more aggregation rules associated with a third party system that determine online system users' eligibility for receiving content items provided by the third party system using the online system users' behavior. When an online system user performs actions related to content provided by the third party system via a client device, events describing the actions are generated and communicated from the client device to the online system. The online system evaluates a user's eligibility when a user performs an action by applying an aggregation rule to an event corresponding to the user's action and other events associated with the user corresponding to the user's previous actions. The online system may re-evaluate a user's eligibility at a later time if the user is determined to be ineligible. The online system provides content items to eligible users for presentation.

Abstract: An online system generates a custom audience based on user engagement with distributed content items. The online system monitors and stores user engagement with content items. A content provider submits to the online system a request to generate a new custom audience and selects audience parameters and user engagement types, such as users who watched a specified amount or percentage of a video, users who interacted with an online system page associated with the content provider, or users who clicked through online system content to a page associated with the content provider. Responsive to the request, the online system retrieves the corresponding user engagement data and applies the audience parameters to generate the custom audience and present it to the content provider.

Abstract: Systems, methods, and non-transitory computer readable media are configured to provide a plurality of control modes to selectively control display of content items in a news feed of a user. One or more content items associated with a predetermined entity selected by the user or a predetermined event are identified based on at least one control mode of the plurality of control modes. Display of at least one content item of the one or more content items is provided in the news feed of the user.