An anonymous post on social media has exposed the fault line of what has been called "rape culture" at Rhodes University.The post - on a Facebook page called RU Queer, Confessions, Questions and Crushes - named 11 people it alleged were guilty of rape or sexual assault.On Sunday night a group of students rounded up the alleged offenders on the campus.A few students were detained by the group. One was still being held against his will at 8am yesterday, said university spokesman Catherine Deiner.By yesterday afternoon, the Facebook post had been removed.The Rhodes Confessions group has condemned the posting of the list."It would be grossly irresponsible on our part to circulate harmful or malicious material that can have detrimental legal implications for Rhodents in both their current and future endeavours," said Rhodes Confessions on Facebook."We reiterate, we will not inadvertently be rendered a platform to bully, harass, accuse, prosecute or defame individuals."Sian Ferguson, of Chapter 2.12 - a campaign to address the rape culture at universities - said: "While the rape culture at Rhodes University is a significant problem, this is an issue that exists at most, if not all, universities."The university's vice-chancellor, Sizwe Mabizela, said: "We send a clear and unequivocal message that rape and violence of all forms are unacceptable."..