1. A computer-readable medium including executable instructions which, when executed, enable tagging by: identifying a contact as a person of interest to associate with a tag; presenting a number of recommended tags including presenting the number of recommended tags based in part on information collected from electronic communications with the contact; tagging the contact with a characterizing tag, wherein the characterizing tag identifies information associated with the contact and defines an association with the contact based in part on prior electronic communications with the contact, wherein a tagging user can add characterizing tags for other persons of interest by selecting another contact to tag with a same or different characterizing tag, including presenting one or more recommended tags for each person of interest; identifying other users that share a common characterizing tag; and, storing the characterizing tag in a tag store, including storing identification information associated with a tagging user that tagged the contact as the person of interest with the characterization tag.