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.

It's called Hoygan by the way.
From what I've seen, mostly the very uneducated ones use this crap, Mexicans and so on. Argentinians, for example, talk like normal people most of the time.