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[1] MPs, see http://www.telegraph.co.uk/technology/internet/9230439/Labour-MPs-support-opt-in-system-for-online-porn-to-protect-children.html
[2] See, for example, Premier Christian Media and their campaign
[3] ORG's research
[4] See Coadec and [5] Computer World
[6] “Even when set at their least restrictive blocking configurations, filters block an average of about one in ten non-pornographic health sites resulting from searches on the terms “condoms,” “safe sex,” and “gay.”” – See no Evil: How Internet Filters Affect the Search for Online Health Information, Kaiser famiuly Foundation, p.8
[7] The Register