Location Based Message Board

We are looking to build a website allowing users to search a venue/place by location (through APIs including - Google Local Search, Simplegeo, Yelp, Foursquare, etc.), then post on a virtual bulletin board tied to that specific location. User will enter venue by location (e.g. Starbucks, Los Angeles, CA). ? This will bring up a results page of Starbucks in the vicinity. ? Clicking on a link will bring you to the bulletin board for that specific location. ? If no message are attached to a particular venue, users will have the option of posting a new message. Search function should also include the ability to browse all messages by location (and not necessarily by venue).