What technology Facebook uses for links?

Just wanted to know what technology facebook uses while posting links. I have noticed that whenever i paste a link on screen, i get the link as a page.

For example,when i paste youtube's link... it displays as a video and i can play it there only.

Can some one please let me know how it can be done. what all is needed


What they do is probably to parse the link(regular expressions are useful here), get ID of the movie and embed a player using Youtube API. Here's documentation of the API: https://developers.google.com/youtube/player_parameters

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