Useful overview to social media

I know I bang on probably far too much about Twitter on this blog, but it is such a great source of useful info and links to resources. Here is another one that was flagged up recently by one of the very interesting people that I follow, Drew B from Hotwire (hope I got that right!). It is a slide show produced by one of their clients giving an overview and some useful stats about social media. I like the simplicity of this: