I had this built to scratch my own itch: I would always find videos that I wanted to watch and bookmark them. And then I'd lose them in a sea of bookmarks. Whenever I wanted to watch something, it was hard to find something that fit how much time I had. So this solves both those problems.

I say "had this built" because it was my little experiment in management. The whole thing was put together by a team of 4 (including me) and now we've launched it without me writing a single line of code. Since I'm the guy who's usually coding nonstop to launch something, it was a refreshing change and a fun experiment.