YQL

You know that nice little Facebook feature where you paste a url into your status and it displays the title, description and an image? Using jQuery & YQL you can build code that behaves just like it. This demo will show how to capture a url, submit it to the YQL Web Service, customize the response using XPath and display a link preview using jQuery.

With YQL (Yahoo! Query Language), you can access data from multiple sources using a SQL-like language that lets you query, filter and join data. If you're already familiar with SQL syntax, using YQL should be fairly straight-forward.

select * from Page not found.profile where id='screen_name'