Mine, too (he's 11). He's also got an XBox live account for Portal 2, a youtube / gmail (mostly for videos about Minecraft and Kerbal Space Program), and an account here: http://scratch.mit.edu/ .
None of these things existed 11 years ago, and I expect there will be a new set of things 11 years hence.
I set up a delegated Gmail account for my son so that I can monitor and rescue the account. He uses Steam for online gaming (mostly gmod), and Facebook.
My daughter's iPhone is set up with my Apple ID, but her Gmail address is used for iMessage, Facetime, etc. Aside from the ability to use 'Find my iPhone' to locate her if necessary, I can also lock the iPhone remotely when I get a RenWeb alert that she didn't turn in her homework!
My 3 year old daughter has been actively using an iPad in some form or another since around a year old. I don't plan on censoring or controlling her access but would review this based on changing circumstances.
Her use is (casually) monitored in case any issues do pop up, though I consider this unlikely for a few years as she's only into Disney-style apps and a handful of toy unboxing subscriptions on YouTube. I've not noticed any opportunities for offensive or inappropriate content coming up so far, although this could change when she can spell and type! :-)
Haha, yes, that's the first thing she got into and she still watches them. Mostly http://www.youtube.com/user/FluffyJetProductions who is quite entertaining. This has now fuelled a rather expensive Kinder Egg habit..
I post a lot of family pictures online but I never post anything that I'd consider embarrassing for my children. Nor do I post anything on Facebook that I wouldn't want a random stranger to overhear in a shopping line.
Beauty in this case was that she did not felt restricted with computer time, and she can do other things, and go back to computer whenever she wants. 1 hour computer time creates way more problems that solves.
I'm curious to see how people introduce the Internet to their children in a relatively-responsible way.