Seven striking US based Q3 stats from those research-minded folks at Nielsen:
1 Nearly 4 in 5 active internet users visit social networks and blogs
2 Nearly 40% of social media users access content from their mobiles
3 Social networking apps are the third most-used among U.S. smartphone owners
4 Internet users over the age of 55 are driving the growth of social networking through the Mobile Internet
5 Social networks and blogs account for 23% of time spent online
6 US internet users spend more time on Facebook that any other online brand
7 Internet users in the UK viewed 229.6m pages on Tumblr – the second most after Facebook

Nice stats. I’d like to see the ‘blogs and social networks’ stats as separate as I have a feeling that they are inflating blog use somewhat.