Probably bad or terrible, because so many judgements are made based on looks when meeting in person. It would help attractive women and men who get tons of interest but it probably would not help the men and women who don't get interest, it would just delay their rejection.
like old times messenger/twitter/internet in general. I would say one like that would be very successful :) like snapchat ended up growing like crazy for a while.
It could be music tastes, or a drawing made by yourself, I'd like to date someone funny, even if she's not hot and we do not have physical attraction I'd love to hang out and have a good time with her.
Noone would use it if it's regarded as a dating app. Maybe some kind of discussion board that can enable people to date or meet up in a non-awkward fashion...
I mean I think it's a terrible idea but so many people already post photos that in no way give an accurate representation of how they appear in person.