i don't mind internet speech by itself. for instance, i use the term "lol" and i have friends who use "1337" and that alone doesn't bother me. what i do hate is when entire sentences are made from it (usually found in Lolcat form) and what annoys me more is how people somehow become completely fluent in it, especially people who i would have least expected to become so fluent and would start messaging me in that form.
another thing i've found that does annoy me by itself (well, its never really used otherwise) is the term "/thread"
why do you ask? because its never used properly. a mod comes along, finds that a thread is attempting to breed... i don't know, a cult of anti-somethings or other, the mod posts "this is inappropriate, this has to stop now. /thread" and then the mod will proceed to close the thread, placing probations and even banning certain culprits. that would be it in proper use. but its not even necessary in its proper use, the mod doesn't really need to post that.
its only ever used in the context "here-is-my-opinion-which-is-evidently-correct-and-thus-there-is-no-further-need-for-discussion. /thread"
and i don't know, that just really grinds me. i read that in the high pitched "nyeh nyeh nyeh, self righteous tosser, nyeh nyeh" voice and its just.... grrrrr
i guess its really slang, its just using something that sounds like a command to be entered into the "run" program. and it just makes them seem like self righte... oh wait, i already said that. either way, the thread never ends just after they type that, there will be at least another page of posts past theirs within a few minutes. And their opinion is usually beaten by something much more convincing as that someone else took time and effort to present their own opinion, rather then just spewing something that can barely be considered a response and smugly stating "/thread".
and now i feel the need to type an extra sentence, just so i can't be accused of hypocrisy as without this my post would end in the dreaded words (quotation marks aside) that i so hate.