Moxie/cujoe/myself are the the only people I know of who are playing.  Joining servers through the browser is a little bugged at the moment so it's near impossible to play together.  I'd maybe give it a week to a few days to settle down.  Unless youre fine playing by yourself.  I just run around, collect guns amd kill people.  Also exploring the map to find the best spawns/defensible locations.