As the web of data approaches, we have ever newer methods for identifying celebrities and stars. A case in point is Traackr, surveyed here by Bill Ives, which uses a variety of keyword-based metrics to rank authors in scales it calls 'reach', 'resonance' and 'relevance', a triumvirate of quality used to create A-List rankings in various disciplines. Ives has set up an A-List of people in enterprise social media. "People dominate brands," explains Traackr as it describes its approach. "These online influencers mastered the art of capturing the attention of an audience and sparking conversations on the web around issues, products and brands they care about." There's a distinction worth drawing here, that the people who capture Traacker's attention are not the experts in the field, but rather those in the field who are experts at capturing attention.