Open Graph tags. They facilitate the thumbnails/descriptions/etc. that automatically show up when you post the link to various social networks. http://ogp.me/

Without them, Facebook/Twitter/etc. have to guess what the most representative image and introductory paragraph describe the link. They often miss.

OG is for Open Graph http://ogp.me/

open graph or original gangster. You decide.

I see what you did there and I like it.