There are actually quite a few excellent questions on Quora, and some really outstanding answers. Not to brag or anything, but here's a list of questions I've answered and the answers that go with them:
Yes, some of them are what one would call "dumb" questions. But that doesn't mean they can't be fun to answer. A whole lot of satirists have a great time with them.
Some of the best social media writers I've encountered are on QUORA.