Your examples explain it. “back hurts, anyone know a good chiropractor”, and "my phone cracked anyone know where to get it fixed.” People trend to trust other people, so why would they trust you? What curation and validation are you doing on the businesses? If you are rating them, what are you basing your ratings on? These are questions that I think about when I hear your business. Also, it sounds complicated, and non-scalable.

What you can do: if the people are already on twitter, go to them. Create a twitter-bot that people can follow, and it automatically follows you back. When someone says "my back hurts", you use natural language processing on their tweets, and recommend a solution to them, gluing together Yelp, Angie's List, or anything else that might be relevant. Offer three months free, if they like it, they pay a monthly subscription. If not, take them off a list. When successful enough with consumers, you MAY be able to turn around and start charging businesses, but then, you have the responsibilities of curation, and I think it's easier to let companies who specialize in that ( like Yelp or Angie's List) do that, and you piggy back off them. Check if you're allowed to use their data, and if they charge for it.