1. A method, comprising: modifying an interface to a social graph comprising nodes connected by edges that represent relationships between the nodes, wherein the nodes form a plurality of trees associated with users of the social graph, and wherein modifying the interface comprises: adding a first node to at least one user's tree; and attaching at least one query to the first node, wherein the at least one query operates on a sub-tree of the first node, and further wherein the interface is modified in response to the at least one user invoking a service configured to perform the at least one query on the sub-tree.