Yes, you could go to jail for admitting to a rape on Reddit »
Here’s how it would work. […] Whoever left the comment used a dummy account, but Reddit still knows everything about the guy, including his IP address. Under threat of subpoena, they’d have no choice but to share that information with law enforcement. It’s happened before.
I don’t think that this is a bad thing. You’re a rapist and you deserve to be caught.