My single Internet pet peeve: Those who are too goddamned lazy to type using real words and real syntax.

I don't want to translate from single letters and numbers to a massacred jumble that sounds like English.

Examples include :"yru so blah?" "i h8 it wen blah."

God forbid that you would have to make another keystroke or two to complete a word in full.

And for the love of God, use punctuation.