What is Luv?  Baby dont hurt me

HgLuv Grid is a free, open source, 3D virtual world.

We are one of thousands of small, independent, grids, that make up the Hypergrid. Residents can freely communiticate, travel and participate in a huge, global community. Much like Friendica, all of the individual grids have their own style, theme, rules, community focus, but are interconnected.

What do people do in HgLuv and OpenSim?