MINER4EVER LIVE is now open beta! M4E Live is an open world MMO voxel based game where you and your friends build on your own land. The game assigns you a piece o land nearby your facebook friends to maximize the fun. The world is persistent and infinite. The client is webgl based (android client is coming soon) and communicate with the server via websockets. Both client and server are made with Unity3d.
Note that is an open beta, there could be slowdowns and outages. Have fun!
Check it out here: