I wonder how long it will be be before this type of Mass Hysteria situation can occur with geographically diverse groups who are linked via online social networ

I wonder how long it will be be before this type of Mass Hysteria situation can occur with geographically diverse groups who are linked via online social networking. Obviously once people start hanging out in shared video conferencing situations you have the possibility of people copying one another's visual cues and perhaps that leads to this disorder. Has anybody heard about this happening over facebook yet?