As a lot of people on Twitter would have you believe. Though some Conservative students did.
A false message is spreading on Twitter and Facebook implicating David Cameron in the production of "Hang Nelson Mandela" posters during the 1980s.
A faction in the Federation of Conservative Students did print Hang Nelson Mandela posters during the mid-1980s.
This account explains how a faction of FCS members printed the slogan on posters, badges and stickers in 1985 without leadership approval in response to left-wing students wearing "Free Nelson Mandela" stickers.
Soon afterwards the FCS proved to be too right-wing for Norman Tebbit, who closed it down. At that time the organisation was led by future House of Commons speaker John Bercow.
Cameron started his degree in October 1985, after the FCS faction had printed the material. According to his biographers, Cameron was "not active in student politics" and showed little interest in Conservative student associations.