Good idea - sort of remind me of YikYak. That was really fun & actually a great way to get local tips if you were new into an area with a good community. Towns it was dead, but if I was in a city that I'd never been to before, put a question out and you would get some real good insights.
It faced a fair few controversies & got taken offline and not sure what became of it...
Always wanted something with that... casual fence... to think of a better word again