Data includes February 2009. From Nielsen Netview. Edit: I am measuring unique users.
If you want other data … get a Nielsen account 😉 I will say Facebook is killing the others when it comes to time spent/pages viewed (ie, the engagement metrics). Average time spent on Twitter per month is just over 9 minutes (3 hours for Facebook) with on average 3 visits per month.
I am sure people will dispute these or use Hitwise figures which don’t really, y’know, tell a story of any meaning. How many of the social media experts actually have access to data about the platforms they claim are changing the world. I have never seen a Twitter preso with real local data.
Sure, Twitter is up – growing at significant rates off low base. Facebook down month on month but is the leader now by a mile and is the most sticky site in AU. Myspace – down, down, down numbers and engagement wise over past 15 months but respectable numbers and still strong and shifting focus towards content initiatives.
Re Julian’s question below about Tweetdeck – to be honest I don’t know.