Here is what I want to exist: an internet dating site for people who read books. As in: a lot of books. Or for people who make art, or write, or make music, or appreciate art and writing and music in a way that has becoming a defining factor in their lives.
It would have a multilingual interface, where you have to enter the languages you speak and the books/art/music you love. Maybe write something about yourself that would illustrate your individuality, wit and intelligence. It would have people in places all over the world, from places all over the world, but a decent number of them would be in Berlin so I would get to go on dates. As in: dates with men who don't think it's crazy to read a lot of books and are not intimidated by women who do so. Who can talk about books but also about other things like favourite ice cream flavours or whatever. In a halfway intelligent manner, you know.
I don't have the time or the technical wherewithal to invent this site, so I've simply come up with a name (see above) in the hope that someone will be inspired. I've never done internet dating but I hear it's quite good if you know what you want. Obviously, I don't.