Am I the same person on line as I am in real life? Nope.
For one thing, I cuss like a sailer in real life!

I have major potty mouth, so I'm sensitive to the protocols of the various sites and groups so that I don't inadvertently offend anyone. Some sites have specific rules about profanity, others don't mention it, but still I'm careful to observe the general tone of the postings so I know what the boundaries are.
Come to think of it, I do that in life, too. I censor myself with a new person or group till I can suss out acceptable language.
The other thing that makes me different in real life is that I'm Australian by birth though I've been in the US since the 70's, and I still have a bit of an Aussie accent. To my Aussie friends, I sound like an American, but to americans they can always hear the accent. Meeting someone for the first time that I've known virtually is often a surprise to them to hear how I actually sound with the accent and all.
So, if we ever do meet in person, be prepared!!

Other than those two things though I'm pretty much the same I think. My name's the same, I'm just as talkative (read "motormouth" lol! ) and I'm the "social" one....friendly and outgoing.