Now Google has released Lively and Facebook is giving us Vivaty.  Just how many virtual worlds do we need? And how in the world(s) are we supposed to choose?  Valibrarian just entered both new worlds and compared the two environments.  This animoto video shows the “cartoon-animation” type avatars in Lively.  I also made an animoto video in Vivaty, which has more realistic avatars.  Neither environment allows for the creative possibilites of Second Life (where users can build just about anything themselves).  Both Lively and Vivaty are pretty easy to use.  I was able to play one of my machinima videos on an inworld screen in Vivaty in just a few minutes (Something that took over six months to learn in SL).