(Web-service) Showing search results with related keywords

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I've tried out Youtube and Flickr apis. It's quite nice that both services are providing api that return the results in JSONP format.
JSONP(JSON with padding) is "a JSON extension wherein the name of a callback function is specified as an input argument of the call itself." by Wikipedia, or it's an api that returns data in the Javascript's Object format with function call to tell the application that the loading is done.
That means it's a handy way to make a web application only with Javascript circumventing a security limitation which occurs when using XML or other formats.

My idea is that it may be convenient if the keywords related to the original search keyword so that they will help the user to narrow down the results or notice a relationship he/she never thought.
For example, let's look back at 2008. Searching keywords "election 2008" in "YouTube relational word search" shows the movies with familiar names like "Obama", "McCain" and keywords like "President", "USA", "Comedy"(It's interesting that "Comedy" is in the first place with big typeface). Cliking a word will add narrow down the results adding it to the search keywords.



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