I blog on dreamwidth which is like Livejournal, only better, and I spend a lot of time on this forum The forum is aimed at people who play Second Life but we talk about all sorts of things, and it’s a very intelligent and mature bunch of people. A lot like Flutherites, actually.
Facebook, various webcomics (Questionable content, Girls with Slingshots, xkcd), HealingWell.com’s ostomy forum, Flickr… that’s about it. I blogged on Livejournal for many years but lost interest, and used deviantART until they started hitting me with drive-by viruses.
Yahoo! Small Business. But that’s no surprise. I am a Yahoo! Small Business Partner and Yahoo! Store Developer. I’m on there just about all day every day.
Facebook, Lamebook (which is hilarious), Mental Floss (which is interesting and often funny), WordReference (an online dictionary with some super-helpful forums), Biblioteca Italiana (where I get most of my Italian texts for school – those that are public domain, anyway)