Yup, this is how well the Porn Block filtering system works:

Welcome to David Cameron's future: my porn-blocking blog just got porn-blocked! My comment… http://t.co/npc5ClGtua

— Paul Bernal (@PaulbernalUK) July 26, 2013

BTW, the filtering system praised by UK Prime Minster David Cameron is controlled by Huawai, which has recently been criticized in the UK for lack of oversight, and which US intelligence decided was a "threat to national security".

Whether you consider that a problem or not, the point remains that the filters block access to information and this is going to be as fun and well thought through as Tumblr's debacle of filtering tags like #gay, #lesbian and #bisexual.