Preventing comment spam?

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.

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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?

there is heaps of decent comment plugins, one like recaptcha should do the trick, you will never get rid of it completely but you can stop the bots most of the time.

may be I can help you. send me your direct email. I've got a captcha script that might prevent from auto posting.

also akismet might help if yu use drupal or gaypress

in wp i just add http:// to the forbidden word list which works like a charm!

Hey guys, thanks for the help. As I said before, I'd prefer to stay away from CAPTCHA scripts for the time being unless it becomes necessary.

I might try out askimet or typepad antispam though. Those might be good temporary solutions, but I bet they'll be deprecated within a couple of years.

I made a comment here: http://penguinationproject.com/how-to-fight-against-spam/comment-page-1

Read that... my comment is practically a page long on how to stop spammers... The Admin of the site even said I did a nice job n my comment. =)


... I also spent time last night working on a script for php sites... So now if a dirty bot (dirty bot = does not respect robots.txt) goes roaming on my site as soon as it does it automatically becomes ban from every site on my server.

... Also take out any word press or other blog identifiers that a spam bot could use to find you.

pnarf, I know you said you didn't want captcha scripts, but it will become necessary. http://woork.blogspot.com/2009/02/10-free-captcha-scripts-and-services.html

I think akismet + captcha should do the trick, tha is what worked for my drupal site, but if your site is very popular then you would have to do saome manual work sometimes