I'm in the process of building a website atm, and I thought I might be able to get some advice from you BH SEO experts here.. Not sure how willing you guys will be to help me, but I thought it would be worth a shot since I bet you guys know a lot about this stuff. Right now on the site, anyone (guests) can comment, and there's no CAPTCHA. However, I have some simple regex preprocessing that edits all links within comments. For example, in a comment: h**p://any-website.com is changed to h**p://my-domain.com/redirect.php?u=h**p://any-website.com I believe (but I'm not sure) that this should prevent the creation of backlinks. Also, I'm planning on modifying something like this ( roscripts.com/PHP_Proxy_Detector-75.html ) to prevent the use of proxies, and implement a feature for comment flood control based on their IP address, like allow only one comment per minute or something. ------------------ 1.) Would the above be enough to prevent (or at least discourage) comment spammers? 2.) Are all comment spammers out there just to get backlinks? Or are there other varieties of comment spam? 3.) Any other suggestions for preventing comment spam?