Twitter, Linkedin, Monster

Numbers from Compete for Jan 2009

Twitter - touching 6 million people/month - 812% growth over one year
Linkedin - over 11 million people/month - 146% growth over one year
Monster - over 33.5 million people/month - 58% growth over one year

Looks good for these 3 so far. A lot of aggregators going at Monster, not sure if the numbers exclude these.