28. The method of claim 27 , wherein the random walk algorithm comprises recursively selecting neighboring nodes related to a previously selected node until a node is selected that is used as an advertising label.
28. The method of claim 27 , wherein the random walk algorithm comprises recursively selecting neighboring nodes related to a previously selected node until a node is selected that is used as an advertising label. 29. The method of claim 28 , wherein the random walk algorithm comprises maintaining a count of the nodes used as advertising labels.