What sort of person uses social networking sites in the UK?

I’ve been crunching data to get a picture of what sort of people visit the leading social networking sites. Here are three charts I created to show the distribution of age, education and income of users of the UK’s top 18 social networking sites in March 2011:

(click any chart to enlarge)
Age Distribution

Education Distribution

Income Distribution

I last ran this data back in September 2010. You can find those charts here. Hope you find this useful.