That, of course, would be parentheses, and has nothing to do with British/Canadian spelling.
Well. The only thing I can think of that might give me away is my habit of starting a post with a one-word sentence. But I don’t do it all the time. Other than that I would be suprised as hell if anyone ever recognized me.
I don’t have any unique posting quirks.
Regards,
Shodan
Tediously verbose posts.
For lord knows what reason, I seem to post to threads where Nurse Carmen has either already posted what I wanted to say or, usually, something much funnier. For that reason I’m going to try and get him banned, then I’ll recognize him and report me to the mods… because I’m a real bastard.
I cannot type all that well and so I usually transpose some letters, like ahve etc. Also, I consistently miss the propre place for the apostrophe in contractions, like this: didnt’.
That and my impressive intelligence, rapier wit, stunning good looks and sunny personality which is of course my signatue everywhere… 
Unless I concentrate, I can not make neat paragraphs. Instead, my posts come out as large, ungainly bricks. When I do try and divide them into paragraphs, the sentences always look too thin, and I realize that the sentence I just dived played off of something in the last paragraph, so I should have just left it as a brick. Grrrr…
That, plus the fact I am unable to keep to the social talk, but instead just going to other forums, to arguing with idiots who stick to their preconceived notions, and would do the same should Philip of Macedonia himself speak to them. (Yes, I realize this is how some people see me, too.)
My misspelling of reletively common words and not knowing it haunts me and would probably unsock me and my use of (like others have mentioned about themselves) parenthesis.
I also have a tendency to revert to anecdotes to make a point. I once had a fellow whom I trained to be a city editor, and he said that I was probably the only person alive to train people completely by anectdotes. He said it was entertaining and pretty effective, but by the end there were times he just wanted to shout, “Don’t tell me a story about it! Just tell me what to do!”
Oh yeah, my ability to bring in newspapering into almost any discussion.
Nobody else has an ex like mine.
I tend to overuse hyphens to glue together run-on sentences, rather than simply making two separate sentences.
Also, I’m a complete dick.
Or in other words “I substitute pointless fonts for actual thoughts”.
My posting quirk is the fact I don’t do it much anymore.
I love you.
Wouldn’t happen; too much respect for the rules. But as for the quirks…
Generous use of smileys, the spelling of “smiley” itself, and insistence on always using the Oxford comma. Being too deep, technical, and verbose when the subject is astronomy, optics, physics, linguistics, etc… and not verbose enough when the subject has to do with real life or people. :smack: Plus the tendency to edit every damn sentence ad nauseum because the wording just isn’t quite right, resulting in an odd wording that is too full of connective words and qualifiers and might be redundant. 
Paragraphs strictly limited to a certain length that “looks right”. Excellent spelling, unless my lightning fast fingers accidently transopse two letters or a letter and th espace bar, or my long nails press on an adjacent key, or I’ve simply never learned how to correctly spell the word. :eek: (And you’ll never see me type “women” when I mean “woman” - why is this so common anyway!? 
) And last but not least, the tendency to add an in-conclusion type one liner at the end of a post.
They’d have no problem ID’ing me, but I’d never even try. 
Correct me if I’m wrong. Sentence fragments. Overappreciation of puns together with an inablility to make same. Odd little misspellings. Sudden wrap-up sentence.
Did I leave anything out?
Me too.
You’ve actually gotten much better, Scott. Mind you, the atheism would still be a dead giveaway…
Well, besides “not posting,” which other people already mentioned…
I try to tone it down here, but sometimes I have a little too much of a fondness for anime smileys. O_o
Actions in asterisks. cringes
Short.
Paragraphs.
And.
Sentence.
Fragments.
When I was younger I overused ellipses like a crazy thing… but not so much anymore…
In that case, I would probably get mistaken for you, as I tend to overuse those as well!
And I, too, spell it “apologise” instead of “apologize”.
I also start too many sentences with “and” or “but”, and type “Hehe” sometimes. Oh, and “Ahh.”
Usually when I post, I am posting from this computer, which has a keyboard with a broken “L” key. It works somewhat, I just have to whack it. Often I don’t whack hard enough, and I miss Ls, and then I don’t notice it when I reread. So, add in missing Ls.
Though I don’t post much to begin, I suppose!
(And hehe, on preview, I noticed I had typed “apologise instead of apologise”. Old habits die hard!)
Of course not.
Regards,
Czarcasm
Damn.
Does this mean I’m banned?
Regards,
Err - never mind