Im new in philly, just out of college, and don't know any one...what is there to do here for 20somethings?

All good suggestions above. Also, plenty of places to hang out in Center City, Manayunk, East Passyunk, the Old City, East Falls, Fairmount and plenty of other areas. If you can suggest what kind of interests you have, you can probably get some detail on other things besides places to hang out. And for hanging out, it's always good to have what guys call a "wing man" along. It can be frustrating to just sit around somewhere by yourself. Maybe someone from work could come along to keep you company.