Say you were banned and decided to come back (Gasp!). What unique feature of your posting would be the dead give away as to who you were?
Mine would probably be that I use quite a few parentheticals (I noticed while writing this.)That and I go days with just lurking, then go on a posting spree, starting two or three new threads, and commenting on others in one day. Then, back to lurking.
Omniscience.
I have none.
If I were ever reincarnated as a sock, the only way you could tell it was me is if I posted in a clothing, handbag, shoe or gourmand thread. Even then, only two, maybe three people would recognize me, and even that would be a stretch.
Witty reparte`.
–underlining for emphasis (though I could stop that easily)
–overuse of parenthetical statements (much harder to stop)
–run on sentences with lots of semicolons
–complicated sentence construction in general
I’d be discovered in five seconds flat.
I do “this” and (this)…this.
I aplogise for those but at least you know I’m me.
My quirk is only posting an average of once per week 
I didn’t think I had one, but I post on another board under another name and Jervoise - the cunning little vixen that he is - posts there too and he unmasked me.
He read me on here and over there and outed me because of the way I use the return key. The return key!! :eek: I was shocked and stunned to say the least and it made me very wary of exceedingly clever Australians I’d never met, let me tell you!!
It would be my inability to sopt typos.
The ellipses, the brackets (but can I help it if my thoughts overlap and I have to run off on a tangent mid-sentence?), and the dash-breaks - like this - throughout. Also a tendency to pair up words by joining them with hyphens - I suspect it’s probably grammatically acceptable, but I probably over-use it.
I tend to create very short paragraphs.
The final clue, of course, would be the big-grin bitey smiley. 
I don’t think the parentheticals would give any of you away (since enough of us(ab)use them (although I suppose that would only apply if several of us got banned (and decided to return) at the same time(which seems unlikely, not that I mention it)).
I would be given away by my gourmandism and my passion for lost and abandoned gloves. (Hey, when are you guys going to send me some pictures of lost gloves you’ve found, anyway?)
Quirks?
Quirks?
I have no quirks.
Who told you I have quirks?
Like BWP, I tend to end my post with a big grin.
That, and my appearance in any thread that even remotely involves beer would give me away in a heartbeat.
I use diereses and accent marks, à la the New Yorker. Some have denounced it as a pretention, but I don’t give a rat’s ass. I don’t get ridiculous about it, though. I insist on coöperate, reïnstatement and reëlection, though I’ll still write going instead of goïng. That would be ridiculous. Likewise, while I’ll insist on blasé and façade, I’ll let them drop when it comes to words that have been more anglicized, like debacle (as opposed to débâcle, which I saw in a first-edition British publication as recent as 2003.) When it comes to place names, I’ll go with the anglicized spellings and versions (Cologne instead of Köln, Lisbon instead of Lisboa, Warsaw instead of Warszawa, Vladivostok instead of Владивосток. But if there isn’t a generally accepted English version of the place, I’ll keep the accent marks in, like in São Paulo or Besançon.
I do this on all message boards and in everything I write on, y’know, paper. I try to be anal about my grammar and spelling, too, but with a little effort I can fake bad spelling. I know the ASCII codes for all the accent marks and diereses by heart, so at this point, it’s more of an annoyance for me not to use them than to do so.
Maybe it’s inconsistent, but although I know how to type Cæsar, I’ll still write Caesar, when the occasion arises. I prefer to write Œdipal but, being (not beïng) an American, I won’t write fœtal (or pædophile, for that matter.) I’ve got my own style manual (subject to change,) and abandoning it for anything apart from official manuscripts is too unpleasant for me. So you’d know me, yeah.
My utter and completely adorable, wonderful sweet perfection.
Serious answer: Overuse of smileys, smooching and snogging, and blatant displays of flirting. You guys would peg me in a second. 
Ellipses…lots of ellipses…
…and the small-font afterthought sentence.
Mine is not posting.
Which I guess I’m ruining by responding to this thread.
On the other hand, if I kept with it, it would make it very hard to detect me.
Pft, you post more than I. I was here almost a year before you and only have 89 more posts than you!
For lord knows what reason, I seem to post to threads that Lieu has either already posted to or will in the near future. When I get banned, he’ll recognize me and report me to the mods. That bastard.
My punctuation outside of parenthesis (just like this).
My British/Canadian spelling.
Overuse of
Malapropisms.