Only slightly. I'm definitely more open and better at communicating online. In person, I'm very shy, socially awkward, and have a really hard time expressing thoughts. It's so much easier for me to communicate in writing. It's less personal, and it's easier to be open when I can hide behind a computer. When I'm with someone or on the phone, the whole social element throws me off.
Otherwise, I'm basically the same. Except you can't see how short I really am online. When people I originally meet online meet me in person (we're talking friends-of-friends and certain trustworthy groups here, I don't just meet random strangers), a lot of the time, they say things like "WHOAH, you really ARE short! I didn't think you'd be THAT little!" But yeah, I'm this weird in reality.