I hate it. I think it is a awful mis-use of the word rape.
Clearly having someone post on your facebook account is not anyway near comparable to the act of rape.
I have never been raped but can imagine how it might feel to see 'someone fraped me, Ha Ha, aren't you funny!' to someone who has been a genuine victim of rape.
I also hate to hear people describing some minor set back as rape. I have heard people describe losing a darts match/having to pay more than they wanted for something etc as being raped.
Have they no respect for the true meaning of what it is to be raped and how truely awful it is to compare it to something so mundane.