Comment by jprobert

With regards to #2 on your list "Yelp for Business Services" there is a company called Contact Karma http://www.contactkarma.com/ which aims to do something along the lines of what you're looking for. My company will also eventually be in the space and allow you to search and discover recommendations through friends and friends of friends in your social networks. For the most part we're restaurants, entertainment, and services for now while we perfect the data but you can see if you're connected in anyway by checking out http://www.cliqsearch.com