I use an extension for that. There used to be the collaborative "WoT", but that got issues after it got bought up by a venture capital firm. In general I think

I use an extension for that. There used to be the collaborative "WoT", but that got issues after it got bought up by a venture capital firm. In general I think the individual use (blocking sites I will never want to see in search results) is more important than the social use, so I just use uBlocklist, which injects a "block this site" link after every Google search result.