oh i know what negative hearts are... haha

depending on your (my) mood - sometimes there's a post that needs to be unloved. but i think if you implemented that - most posts would be in the negative hearts.

unsolicited feature ideas to keep things relevant(knowing that scaling, etc are way more important):

let me subscribe to people, while still keeping things anonymous. some posts i really like, etc - that can be used to mix in a higher number of their other posts with my main consumption (if you're not already doing this).

similarly - let me ignore people. you could have some algorithm-fu to keep track if i hit ignore on the same person multiple times - for a real ignore, rather than just a bad post.

i also imagine an overhear.us facebook app is in the works? :)