Query on data exchange between web sites

All,

I have made my own website where the user enters his/her address. Based on the address, I am sending across the same information to various sites such as Foursquare, yelp to find all the information about the ne开发者_JS百科ighborhood. How should I go about technically implementing this feature(s)? This might be a broad question, but I really don't have en exp working on such development tasks.

xml files can be generated to exchange text between websites..

twitter uses json, even you can use that.. there are plenty of tutorials online

JSON Primer