Preventing Spam

Question

How do you stop bots on a page which is accessible to registered users only? 90% page is accessed by real users and 10% are bot.

I do not want to put captcha or veri

Answer 1

Given you have excluded captcha (which isn't 100% bulletproof), you need to check what your users type and allow or forbid their postings.

This task isn't going to be an easy one, so I would suggest to turn your attention to ready-made solutions such as Akismet.