Many creative sites are using two or more sites to create new services. These services have been dubbed “mashups”. Some of these mashups use services such as Google Maps, Twitter, Last.fm, but can be any two web applications to create something new.

Sites often release their API or even their source code to build upon. Because of this, sites like Google Maps are frequently used in mashups.

Below are some of the interesting mashup sites that you may not even know they exist.
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