The 'same' online contrast offline is a big question and an interesting question too. I definitely do not express myself verbally as well as I am able to with writing. I am much more shy offline (Real life?) than online.
Offline I rely heavily on body language for cues with communication. That is a result of a conditioning process. Therefore many times I do not express myself openly as well. Plus, my thoughts get mixed up easily and that inhibits offline communication too. So, I would say I am not the same online as I am offline.