I can relate to Avwave about many things.
I tend to be verbose, both online and off. That's in part because I can't figure things out properly before starting to talk/type, and in part because that's how I like it. I use "posh" words and structures more online, as well as other rhetorical means, in both English and Finnish. More so in English, though.
For some reason I more readily perceive normal English as art (compared to normal Finnish that is), for which reason I prefer to write prose in English. For poetry Finnish is at least on par, but I'm picky about that and don't think I have talents for poetry myself. I like good Finnish song lyrics though, often more than English ones. That may be because they tend to be from Finnish bands.
I'm almost more at home with English online, and vice versa offline. I'm pretty fluent in English I guess, but talking face to face I haven't got the time to look for the words right on the top of my tongue, so I often have to resort to talking around them. After a day or two of constant exposure, though, it becomes more natural.
I love being able to type, because my handwriting is unintelligible.