create a wordpress plugin

http://wordpress.org/ideas/topic/auto-generate-facebook-style-link-preview-when-inserting-url-into-editor

http://net.tutsplus.com/tutorials/javascript-ajax/how-to-scrape-web-pages-with-node-js-and-jquery/

http://www.9lessons.info/2010/06/facebook-like-extracting-url-data-with.html

http://www.webinfopedia.com/extract-meta-data-from-url-using-php.html

http://www.2lessons.info/2012/09/facebook-type-extract-url-data-using.html

http://www.sanwebe.com/2013/06/extract-url-content-like-facebook-with-php-and-jquery