After being annoyed for too long by a spammer, mostly in the AdSense help groups ( groups.google.com ) about a member of Yahoo's eCommerce service, store.yahoo.com .

This service allows you to use your own domain name as a frontend for the service. In this case the member posted several hundred messages in the user group. I contacted the google representative responsible for it after the first stream of spam, and about 150 comments got deleted. This, however, only resulted in more spam, and the group owner posted a message in the forums:

Hi everyone,

I wanted to apologize for the large amount of spam this forum has been
receiving today. I've been working as quickly as I can to stop the
violating user and remove his offensive posts, since, as you all know,
self-promotion is not the purpose of the group.

AdSensePro and I appreciate all of your help in labeling spam topics
and reminding spammers that their behavior is unacceptable. We're
thrilled that the AdSense Forum now has nearly 10,000 members (!!), and
hope that you will continue to contribute in a positive way to this
community.

Again, apologies for the misuse of the forum today, and thanks to the
rest of you for creating such a positive, supportive environment.

Cheers,
-AdSense Help Owner

The domain is using Yahoo's DNS nameservers, so I sent one abuse email to the technical staff requesting a deletion of the DNS records. I also pushed an abuse form to the eCommerce site. But as of yet, nothing has happened, and the user keeps spamming forums, as of now there are at least 150 new messages, this time posted using multiple profiles to make it more difficult to cleanse.

The Yahoo abuse department is hereby marked with an F - failed for their (lack of) effort to reduce the spam-problem.