I don't like sites where you send off your personal info and blast it out to unknown people. But, Yelp was useless and I stopped using Angies list years ago because they hassle contractors. I've seen thumbtack for years and finally gave them a small, relatively-safe shot.
I didn't blast and just sent a msg to one no response "thing". It's a waste and ultimately wonder if it's a data mining site. It's not worth it. It reminded me of Home Advisor and I've never ever used that. Back to the drawing board.