I guess? I talk more online than I do in real life, but I'd say my personality is pretty much the same. You'll always get me the same way, I just have a much easier time getting my thoughts down on paper (so to speak) through text, rather excessively sometimes too.
I think this goes for everyone, but I feel a lot more "intellectual" on the internet. Not only due to anonymity, but also because I have more time to consider what I say.
It's also due to this that I feel a lot more like "me." I'm pretty awkward in real life, and due to that, I mumble a lot and will not say something just for the sake of not being noticed. I wouldn't even describe it as 2 personalities. I think my internet "persona" is just a more articulate version of my irl self.