All the letter is missing is a "via 9gag.com" watermark added to it (well, i guess someone would have to post it to reddit first) Interestingly, the only actual 9gag trademark i can find is for a character mark that was registered 2 days ago.
A mark becomes a trademark simply by its use in trade, registering a trademark just gives you stronger legal grounds.
Yes, i'm a registered patent/trademark attorney, so i'm familiar with the law :)
I'm just surprised, usually they don't go issuing letters until they have something substantial registered.