After Facebook's recent update to the Newsfeed, I got to thinking about how many Facebook features have failed over the years. And I don't mean the now-typical Terms of Service disasters. I mean new ideas, new features, and new products that took developers months or years of work, and just flat-out bombed.
Now, this is one of my lists that's completely subjective. I didn't rate these based on estimates of Facebook's time invested or profit loss or some ridiculous calculation of "flop" factor. If you disagree with my selections or ranking, you won't hurt my feelings, so let me hear it in the comments.