I have been a Facebook user for quite a while, but now I have joined twitter as well. They are both added as gadgets on my igoogle home page.
I am a true Facebook addict, so I am probably going to try to stay away from twitter so I can get to sleep before midnight every night. (But we'll see....)
Just a little tip for the new Facebook users out there...stay away from Farmtown and Farmville!!! It'll become way too addicting. If you don't believe me, just check out my farms. ;)