According to the Sûreté du Québec, Lesiewicz made friends with teenage girls in internet chatrooms, sent them emails which infected their computers with malware, and then persuaded them to pose naked online.
The victims are then said to have been contacted by another internet user called "Dave", who told the women that nude photos of them would be posted on the net unless they posed again in front of their webcams.
So..running Windows on that iMac or MacBook or Mac Book Pro?
http://www.net-security.org/malware_news.php?id=936