Remember Twitter? It’s that service we used a lot before Google+ came around. No, seriously, who had heard of Twitter before 2006? Almost nobody, because it was just starting, they didn’t even call it Twitter until 9 months after the first idea. 2007? A few more users. 2008 really was the first ‘bigger’ year for Twitter, but look now, 2011: over 200 million users and growing. Who would have thought. An overview.