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.

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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