As I'm scrolling through, the vast majority of posts I am not interested in. Even if I do a more specific search, there are plenty of results that I just don't care about. It'd be nice to have a "Not Interested" or "Ignore" button so that the post doesn't keep showing up.
For example, I look for "Snowboard Boots" and get a bunch of hits. As I go through the results, I'll discard some for any number of reasons. Sure, I can add the ones I'm interested in to a board, but now I have to manage that board. I'd much rather just remove all irrelevant results and not have to worry about them again. When I repeat the search next week, those same posts I don't care about are going to show up.