Ha, the exact opposite of when I was a teenager. I had access to my parents' web history, email, documents, EVERYTHING... and they didn't even know how many email accounts I had, much less passwords or what web communities I was involved in. Which is probably a good thing, considering what I was getting up to in the wee AM hours...

I declined their friend request, and if they ever bring it up in conversation (which hasn't happened yet), I'm just going to tell them that it's a personal space for me, and that adding them would kinda be the equivalent of inviting them along every time I went out with friends... which would probably upset them more than me.