Yahoo! Search Marketing Blocked Domains Help
Yahoo Search Marketing recently increased the max number of blocked domains from 250 to 500 per account. What does that tell you? Hmmm...
Yes, they still have a sausage problem. They'd be better off cleaning up their syndication network themselves, rather than placing the burden on advertisers to block low quality traffic on their own. Consider this statement from Yahoo in the comments in response to questions about what report(s) to run in the Yahoo Search Marketing system to find the domains where an advertiser's ads are displayed:

Tags: yahoo search marketing, blocked domains
Yes, they still have a sausage problem. They'd be better off cleaning up their syndication network themselves, rather than placing the burden on advertisers to block low quality traffic on their own. Consider this statement from Yahoo in the comments in response to questions about what report(s) to run in the Yahoo Search Marketing system to find the domains where an advertiser's ads are displayed:
Though we currently don’t have a report that specifically indentifies which of our partners the click came from, we suggest you look into your weblogs for such information especially when using tracking urls.IOW, you're on your own. Yahoo! Well, if Yahoo won't help you, I will. You can use my firm's free, open source script to track clicks from Yahoo ads. It's a quick way to see the domains where the clicks originate:

Tags: yahoo search marketing, blocked domains