Ben Parr has an excellent year end post on Mashable at:
http://mashable.com/2009/12/30/facebook-2009/
Here's the post:
How Facebook Dominated in 2009
December 30th, 2009 | by Ben Parr
To most observers, 2009 marked the year Twitter conquered the world. Yet it wasn’t the only social media company that grew like wildfire. There’s another that grew even more rapidly, adding over 200 million new users and raising $200 million dollars — double that of Twitter’s most recent round.








