Nothing brings people together like hating the same things. But can a common enemy turn two haters into lovers?  That was question behind HatersInLove.com, a dating website that matched users based on mutual dislikes. A former partner and I came up with this idea in ad school, but we had no idea how to build it, so we shelved it. Five years after we graduated, a dating app called “Haters” launched and got 200,000 downloads in thirty days. Ugh. I hate it when that happens.