Why do a majority of American black people spell horribly on social media websites (Facebook, Twitter, etc)?

[quiet]

I always thought it was just a variation of slang. It's like a cultural thing. we had a class in my college where we actually studied ebonics for a day or two and had to translate the sentences into actual english. I sucked at it. But I think it is just to define themselves and their ways by a slang writing style, like when they talk in slang, or dress in certain ways (sagging etc. ) . Obviously they understand it.
I think a lot of that has to do with separating themselves from regular, and formal, and even "white" english. It's almost like a rebellious way to form your own identity, like other groups have done in other ways (hair, clothes, language).