LDraw.org Discussion Forums

As many might have noticed. The forum is regulary spammed by some advertising stuff.

Isn't there a way to prevent that ? Like adding a captcha to create an account?

Numerous controls are already in place (including capcha). The ones that do get through are human spammers or very sophisticated robots. The new forum software is actually better at shutting this idiots out and makes it significantly easier to purge their posts when they do get through.