1. A method comprising: maintaining a profile for a user of a social networking system, the profile including one or more information items associated with data describing characteristics of the user and a set of unknown information items not associated with data; generating a feed that comprises a plurality of stories, wherein each of the stories comprises a description of an action performed by or related to another user of the social networking system with whom the user has established a connection; obtaining a plurality of prompts associated with one or more information items, each prompt having a response probability indicating a likelihood of receiving a response to a prompt when presented, each prompt related to one or more stories in the feed; selecting an unknown information item from the set of unknown information items based at least in part on data acquisition values associated with each of the unknown information items; selecting a prompt associated with the selected unknown information item for presentation to the user based at least in part on the response probabilities of one or more prompts associated with the selected unknown information item and content of the feed; incorporating the selected prompt into one of the stories of the feed to which the selected prompt is related; and sending the feed for display to the user.
1. A method comprising: maintaining a profile for a user of a social networking system, the profile including one or more information items associated with data describing characteristics of the user and a set of unknown information items not associated with data; generating a feed that comprises a plurality of stories, wherein each of the stories comprises a description of an action performed by or related to another user of the social networking system with whom the user has established a connection; obtaining a plurality of prompts associated with one or more information items, each prompt having a response probability indicating a likelihood of receiving a response to a prompt when presented, each prompt related to one or more stories in the feed; selecting an unknown information item from the set of unknown information items based at least in part on data acquisition values associated with each of the unknown information items; selecting a prompt associated with the selected unknown information item for presentation to the user based at least in part on the response probabilities of one or more prompts associated with the selected unknown information item and content of the feed; incorporating the selected prompt into one of the stories of the feed to which the selected prompt is related; and sending the feed for display to the user. 4. The method of claim 1 , wherein incorporating the selected prompt into one of the stories of the feed to which the selected prompt is related comprises: presenting the selected prompt and information identifying one or more users connected to the user previously providing data to the social networking system after being presented the selected prompt.