We do not hack facebook or multiplayer games and our rules also say that we have to remove score submits. Tampering with data that is sent to the server just to manipulate your score is just lame. We hack games to make them easier and with that more enjoyable or easier to beat. I personally think hacking scores just to be at the top is pretty boring anyways.
But if you want to learn about hacking games directly, you are free to go although our Tutorials are outdated:
Tutorials
Tutorials
Like flashgamehacker said Xnite isn't currently looking for more hackers for the site. That should not stop you from trying to hack some games and have fun experimenting.