2. The method of claim 1 comprising: assigning to the first edge a first weighting for the first category type.
2. The method of claim 1 comprising: assigning to the first edge a first weighting for the first category type. 3. The method of claim 2 comprising: receiving third activity information for the sender of a second link to the recipient collected by a collection resource at a Web site; and receiving fourth activity information when the recipient accesses the second link sent by the sender corresponding to the third activity information stored at the storage server.