What can be done to prevent spam in forum-like apps?

Question

Are there ways except CAPTCHAs for web apps like pastie.org or p.ramaze.net? CAPTCHAs take too long for a small paste for my taste.

Answer 1

Check out defensio.com. It uses bayesian filtering (like filters for mails). It's pretty effective. It's a free web service.

Disclaimer: Worked there in the past.