Abstract: In one embodiment, a method includes receiving a request for a measure of affinity for a particular action associated with a user of the social-networking system; and determining results for each predictor function based at least in part upon a number of actions previously preformed by the user with respect to the mobile-computing device. Each predictor function calculating a likelihood the user performs one or more actions; The method also includes computing a measure of affinity associated with the user based on the results for the predictor functions; and providing the computed measure of affinity.

Abstract: In particular embodiments, one or more notifications are presented on a screen of a personal computing device while the personal computing device is in a locked state. Entry of one or more user responses may be detected on the personal computing device while still in the locked state. Each user response may be associated with at least one notification. An authorization event associated with the personal computing device may be detected, thereby unlocking the personal computing device. The one or more user responses on the personal computing device may then be presented to the user for confirmation. Once user confirmation is received, confirmed user responses may then be published.

Abstract: In one embodiment, receiving a notice from a first user associated with a first mobile device indicating that the first user wishes to share information of the first user with one or more second users respectively associated with one or more second mobile devices; accessing information known about one or more users and one or more mobile devices respectively associated with the one or more users; identifying at least one candidate for the first user based on the information known about the one or more users and the one or more mobile devices; and confirming one or more of the at least one candidate as the one or more second users.