10. The method of claim 1 , further comprising: accessing a social graph comprising a plurality of nodes and a plurality of edges connecting the nodes, each of the edges between two of the nodes representing a single degree of separation between them, wherein each node of the plurality of nodes corresponds to a particular object, the nodes comprising: a first node corresponding to the first user; and a plurality of second nodes that each correspond to a concept or a second user associated with the online social network.
13. The method of claim 10 , wherein determining for each identified object a visibility of the object with respect to the first user comprises, for each identified object: identifying a node of the plurality of nodes corresponding to the identified object; and determining whether the identified node is connected to the first node in the social graph by a series of nodes and edges that each have a visibility that is visible to the first user.