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FTC Disclosures Made Simple For Bloggers With Conflicts
On multiple comment submission attempts from the same IP address, a machine challenge or simple comment rejection and banning that IP for say a 24 hour period should work great.
The normal folks just dont submit 20 comments at a time - this is simply not human behavior - and could be used to identify spam.
My 2 cents. I am sure DISQUS has lot of smart folks.
@Vic: On the note about the "same IP address" -- that's the whole problem I had before Disqus. I'd get hundreds of spam comments in a day, each from a different IP address. Occasionally, a few would match the same IP address, but it was so completely spread out that I could just start blocking by IP. In fact, MovableType will automatically block by IP address if it gets more than a couple in a short period of time, so the spammers must rotate IP addresses to keep getting through.
The worst part about comment spam? It's worth their time. People click on their spam and buy their products. Erg.
DisQus team: please correct me if I am wrong (read ignorant) and if you can also use UDP as transport for commenting.
If you learn Computer Science you know that it's possible to fake an ip-address. It's possible so that disqus thinks that packet comes from a.b.c.d while the spammer has ip address b.a.c.d or something. Offcourse Disqus can't sent information back to spammer.
That's how I used Akismet, at least.
Mind you, prior to switching I would get anywhere between 3,000 and 7,000 spam comments per week. No I'm not that popular; it was merely a matter of good SEO and the fact that I'm an apparent spam magnet. Akismet would typically let around 20/week through so I doubled up with captcha and I was ok after that. One of the many things I always found fantastic about Disqus is the lack of spam.
Did you email them? Curious to hear/see their response. Great bunch of guys by the way...