27. The method of claim 1 , further comprising determining a weight for a advertising label for a first node by starting a random walk algorithm beginning at the first node.
27. The method of claim 1 , further comprising determining a weight for a advertising label for a first node by starting a random walk algorithm beginning at the first node. 31. The method of claim 27 , further comprising determining weights for advertising labels of one or more additional selected nodes by starting the random walk algorithm from each of the one or more additional selected nodes.