Why do Latinoamericans write in all caps?

I mean, I'm kinda disappointed by this "JAJAJA ESTOY USANDO EL INTERNET" shit written always in ALL CAPS. Is there a reason behind this? Normal people would not do that.

>>2
Haven't seen it outside youtube though.
Not really, I went to a random Spanish thread and it was full of that kind of stuff. Here's it, see http://dis.4chan.org/read/lang/1172882626