Everyday on the forums there are users who only open topics to advertise stuff, as I see the captcha isn't protection anymore. ;)
A good suggestion can be to make a required field what only shows on the register pages with a question like: "What is the name of the owner of BleepingComputer", the answer would be: "Grinler"
A other option would be KeyCAPTCHA, a puzzle what you need to solve.
It will help against the spambots. ;)
Haters gonna hate.
Edited by M. de Jager, 24 January 2015 - 01:11 PM.