There is a good website called http://www.qplaygames.com/ you get to play with other people and chat with them but you must sign up to chat and have to be 14 or more they have quiet very good...
Dino run is dinosaur multiplayer game. It is very good link: copy this: http://www.pixeljam.com/dinorun/ My character is: ...Dinokkio... But if you mean just a video game, espically where you can be...
There are lots of fighting gun games, sign up required:
Sanctioned Renegades (Download Required)
Sherwood (No signup is required-no download is required)