Adam Singer who writes the FutureBuzz blog has posted a list of ’49 amazing Social Media, Web 2.0 and Internet stats’. The numbers are impressive:

YouTube Stats

70,000,000 - number of total videos on YouTube  (March 2008)

200,000 - number of video publishers on YouTube (March 2008)

100,000,000 - number of YouTube videos viewed per day

Blogosphere Stats 

133,000,000 – number of blogs indexed by Technorati since 2002

346,000,000 – number of people globally who read blogs (comScore March 2008)

900,000 – average number of blog posts in a 24 hour period

For a list of 49 stats that cover Google Search, Wikipedia, Twitter, Facebook and Digg follow this link http://www.thefuturebuzz.com/2009/01/12/social-media-web-20-internet-numbers-stats/