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.
But in 1985 Cameron was just about to start university and never did become active in student politics – so was not a "top member" of FCS, nor involved in printing the slogan.
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.
However, the second part of the message is true: Cameron did accept a paid-for "fact-finding mission" to South Africa under apartheid.
A 23-year-old Cameron, already working for the Conservative Research Department, travelled to South Africa in 1989 on an all-expenses trip paid for by a lobbying company that campaigned against economic sanctions imposed on the apartheid state.
Aides told the Independent on Sunday that he met with leaders from both the pro and anti-apartheid regimes during the trip but it's probably something the Prime Minister would prefer to forget.
Cameron has since said his party was wrong to oppose sanctions on South Africa during the 1980s and adopt an anti-African National Congress stance.