What's your oldest online account? Your oldest and still active account?
I was first going to answer eBay, but I signed up for that in Jan 2000. So, then I started thinking about it, and then I realized that I had my Yahoo account ("sneakernet") for much longer than that. I was guessing sometime in mid-1999, but according to my profile page, it's six years old (June 1998). I think that's my oldest online account, and it's still active.
