I've attempted to post on Thumbtack, looking for concrete service... three times and each time Thumtack support kicked it back saying my request was either "inappropriate; or that I was non-existent. Etc etc." Each time I contacted their customer support thru the email link provided in their email to me... its been a week and I'm still waiting. Gues they must be out on a job... so much for "Customer Support"..