6. 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, 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.
8. The method of claim 6 , wherein each first vertical is a users vertical storing one or more user-profile pages of the online social network, each user-profile page corresponding to a node of the plurality of nodes.