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MOTIVATION: * When you post a link on facebook normaly with your browser, facebook automatically detects a featured image of the link (web page). However, if you post a link through facebook API, it doesn't. So, I needed to develop a similar detection tool which takes url as an argument and returns a featured image of the page. This library contains tiny algorithm to do that. TODO: * make into npm package format. * rewrite this README. * deploy web API and command line API.