Shel Israel Author of Twitterville with an interview of Howard Rheingold,  a social media guru extraordinaire – wrote groundbreaking book The Virtual Community in 1993

Global Neighbourhoods: SM Global Report: Howard Rheingold, Part 1

This guy is a big part,  and one of the best writers/analysts on what we now call Social Media. He is a big part of getting my started in exploring this direction back when The Virtual Community came out,  and what the implications for the church could possibly be.