Abstract: In one embodiment, a method includes accessing one or more content objects associated with a first user of an online social network; generating a set of tag candidates by extracting one or more n-grams from the content objects, wherein each tag candidate comprises one or more text strings or ideograms from the extracted n-grams; calculating, for each tag candidate of the set of tag candidates, a quality-score for the tag candidate based on an affinity coefficient between the first user and a respective content object from which the n-grams or ideograms comprising the tag candidate were extracted; and sending, to a client system for display, one or more of the tag candidates as suggested tags for the first user, wherein each suggested tag has a quality-score greater than a threshold quality-score.

Abstract: Systems, methods, and non-transitory computer-readable media can determine a request to recover access to an account of a first user, the request being received from a computing device of a second user. A determination is made that the first user and the second user are recognized as social connections by a social networking system. The first user is authenticated through the computing device of the second user based at least in part on the first user and the second user being recognized as social connections. A login session is established between the computing system and the computing device of the second user upon authenticating the first user.

Abstract: In one embodiment, a method includes accessing one or more content objects associated with a first user of an online social network; generating a set of tag candidates by extracting one or more n-grams from the content objects, wherein each tag candidate comprises one or more text strings or ideograms from the extracted n-grams; calculating, for each tag candidate of the set of tag candidates, a quality-score for the tag candidate based on an affinity coefficient between the first user and a respective content object from which the n-grams or ideograms comprising the tag candidate were extracted; and sending, to a client system for display, one or more of the tag candidates as suggested tags for the first user, wherein each suggested tag has a quality-score greater than a threshold quality-score.

Abstract: Systems, methods, and non-transitory computer-readable media can determine a request to recover access to an account of a first user, the request being received from a computing device of a second user. A determination is made that the first user and the second user are recognized as social connections by a social networking system. The first user is authenticated through the computing device of the second user based at least in part on the first user and the second user being recognized as social connections. A login session is established between the computing system and the computing device of the second user upon authenticating the first user.