I flirt more with body language and expression than with words, and like to see the same in response, so I don’t do much online flirting. Anytime I try it online, it turns into a disaster (not much different than IRL, but it’s at least more fun).
I don’t flirt anywhere. I’m a horrible flirt. I’m also horrible at telling when another person is flirting with me.
There’ve been occasions when a third party has commented, after the fact, on my flirting with someone. But I’m never aware of it at the time, so I don’t think it counts. I can’t flirt on purpose. - in person or online.
Yeah, you know, my IRL flirting is usually in my intonations and what I say. Don’t do the body language much. Hell, I can’t even dance. 
Darwin’s Finch 
I do like the “I am a non-flirter.” LOL It has its own little ring to it. But you never know… Lamarckism might just prevail and draw out a latent flirter yet. [sub]'Course, now that I think about it, that would only help your kids… [nevermind…][/sub]
sven, yay! [pats grass] Comfy lawn I got here 
My flirt muscle has been in the closet so long, it is seriously atrophied from disuse!
Definitely a non-flirter in real life, and I always miss it if someone is flirting with me.
On the boards…gimme a break, I’m practicing!
I used to be a knock down, drag out, no holds barred flirter, complete with double entendre and sexual innuendo.
THEN I fell in love with the most magnificent man in the entire world and the flirting went out the window.
Go figure…
The last time I “flirted” in a closet I walked bowlegged for 2 weeks. <Cheez…did I say that outloud?>