The Open Graph Protocol enables you to integrate your Web pages into the social graph. Open Graph helps people tell stories about their lives with the apps they use. It is currently designed for Web pages representing profiles of real-world things — things like movies, sports teams, celebrities, and restaurants.

- Stackoverflow.com Wiki
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You probably noticed that some links on Facebook and Twitter looks better than others. They have relevant title and description and most of them have a nice image linked. This is not a coincidence or dark magic and you can implement it for your website in couple minutes.