Any of the horrific text type (4eva is not a word, I don't care what you think), lack of capitialization and correct use of punctuation.
I'm not picky on spelling, seeing as I can't spell, but I see some doozies that just make me want to scream.
If you are going to proclaim your religion publically, and you are Christian, the correct spelling/capitialization is God. It is not god. Also, in those cases, again with the spelling, make sure the word you use is the word you mean. I see accept and except getting mixed up all over these days. VERY different meanings. If you say I need to except Jesus, I'd like to know what I need to do and why do I not include Jesus when I'm doing whatever?