Social authentication

One or more computer-readable non-transitory storage media embodying logic configured when executed to:

• identify, from a first plurality of content objects, a subset of the content objects comprising a second plurality of content objects having at least one content object that is socially relevant to the user and at least one content object that is socially irrelevant to the user;
• identify the relevant content objects based at least in part on whether in a social graph, a node corresponding to the user is connected by an edge to a node associated with the content object, wherein the edge represents a social relationship between the content object and the user;
• identify the socially irrelevant content objects based on the node associated with the content object not being directly connected to the node corresponding to the user;
• provide for presentation on a client device associated with a user a selection request and the subset of identified content objects;
• receive an input indicating a selection of a plurality of the presented content objects by the user in response to the selection request;
• and
• authenticate the user to a social-networking system for accessing a functionality of the client device based on a determination of whether the plurality of selected content objects correspond to the socially irrelevant content objects of the subset of identified content objects.

A device comprising:

• one or more processors;
• and
• one or more computer-readable non-transitory storage media coupled to the processors and embodying software configured when executed to:
• identify, from a first plurality of content objects, a subset of the content objects comprising a second plurality of content objects having at least one content object that is socially relevant to the user and at least one content object that is socially irrelevant to the user;
• identify the content objects based at least in part on whether in a social graph, a node corresponding to the user is connected by an edge to a node associated with the content object, wherein the edge represents a social relationship between the content object and the user;
• identify the socially irrelevant content objects based on the node associated with the content object not being directly connected to the node corresponding to the user;
• provide for presentation on a client device associated with a user a selection request and the subset of identified content objects;
• receive an input indicating a selection of a plurality of the presented content objects by the user in response to the selection request;
• and
• authenticate the user to a social-networking system for accessing a functionality of the client device based on a determination of whether the plurality of selected content objects correspond to the socially irrelevant content objects of the subset of identified content objects.