The origins of social media -- From chaos, structure -- Enthusiasts -- Influence profile--The gadget king -- Measures of influence -- Corporate conversations -- Influencer profile--The corporate renegade -- Small is beautiful -- Putting "public" back into public relations -- Influencer profile--The marketer -- The talkers -- Influencer profile--The sound man -- Tools of the trade -- Influencer profile--The toolmaker -- Going viral -- Influencer profile--the guerilla -- Next steps.