[davidk0101]

I'm not sure how this would be implemented. Where would the blacklist be held and how would it influence the search results? I know that they already do a lot of search customization but most of it is just aggregate statistical computations. It's not that they return results specifically tailored to you but more like results tailored to a very fuzzy average version of you. A blacklist seems way too specific to each user to be susceptible to meaningful aggregate statistical operations like spam filtering which is one of the reasons that spam filtering in google is so good. Each user contributes something and everyone benefits. I don't see that happening with blacklists. I think to make it worthwhile they would need to figure out how to feed the information from blacklists into providing more meaningful results for everyone.

[nervechannel]

That's the point, what I want is exactly a user-specific blacklist.

I can even do that already with Google's Custom Search, all that's missing is a little 'block this site' button. Instead I have to go and configure Custom Search manually for each URL mask.

[jimmyswimmy]

You could write a little GreaseMonkey script or extension to do that, shouldn't be too hard.

[gwern]

> how would it influence the search results?

Presumably it would do the same exact thing as '-site:foobar.com'.