The latest Pew report (covering the USA) provides a snapshot of the social democgraphics of Internet users by categories such as age, race, gender and income: http://www.pewinternet.org/Reports/2013/Social-media-users.aspx
For similar accounts relating to the UK try the Oxford Internet Surveys: http://microsites.oii.ox.ac.uk/oxis/databases
For another good starting point for free data, often with a focus on consumer usage trends try neilsenwire: http://blog.nielsen.com/nielsenwire/category/online_mobile/
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