Send this javascript to any of your friends and ask him to paste it in his address bar. He will receive message that his facebook account has been hacked.
Here goes the script:-
javascript:function reverse() { var inp = " dekcah si tnuocca koobecaf ruoY !rorrE"; var outp="";for (i = 0; i <= inp.length; i++) { outp =inp.charAt (i) + outp;}alert(outp) ;}; reverse();