In a thread, a player asked a question. You mentioned a third party app. Only Pal-Ringo and Photobucket are supported third party apps, all other non-ata apps mentioned will get you silenced.
Did you mention a non-ATA game on campus chat or forums? (I don't really know if you get silenced for that in cc, tc, or pm though :| ) If yes, then that's probably the reason. If no or you don't remember then you should talk to a mod through pal. But be polite.
If you think the silence was wron email support@athinkingape tell them the reason and why you want to be unsilenced
You asked how to draw on pictures. He responded with a third party app. It's just a 24 hour silence. Just chill for a bit.
I was once silenced for asking about mincraft but was talking about the computer game and got unsilenced so it is possibly to get unsilenced