Scriffles: Social media active users and market penetration by country... this is really interesting.

So Australia (80.6%) has a greater internet penetration than Japan (73.8 %) Korea (76 %) US (74%) France (65.7%) Germany (67 %).
Norway (86 %) leads the world in market penetration.
BUT in terms of active users - those who blog, upload video, photos, music, social network _ Australia is behind these guys (probably because our broadband is so bad)
There are 625m approx active users in the world: leading the charge is USA, Canada, Brazil, France and Germany.

This is according to a survey of 22,729 users in 38 countries.
In the past year, the growing areas of activity are: watching video online; listening online; visiting friend's social network page; creating a social network page; commenting on blogs and then uploading photos and video.