I have noted a few things:  Nobody of those who spread rumours about MtGox running a fractional reserve or having solvency problems have taken up my offer of selling their MtGox BTC to me at 90% face value.  And I know several of them hold a balance on MtGox, because I frequently get questions about SEPA withdrawal delays and similar in private messages from them.  There are however many gullible bystanders who do.  People whom the manipulators have managed to scared the brains out of by spreading FUD.