Secondlife is a 3D-internet grid owned by Lindenlab.
The group 4freedom started on secondlife and had parcels on a couple of sims and had manny events.
Secondlife is based on servers from Lindenlab wich are nonfree software. But the viewer is free software (lgpl and older versions gpl)
There are some groups active on secondlife wich are somehow related to 4freedom; like the groups "ubuntu" "freeculture" "opensource scripters" and more.
The weekly meeting is sometimes on secondlife