The http-equiv attribute provides an HTTP header for the information/value of the content attribute. The http-equiv attribute can be used to simulate an HTTP response header.

Open Graph Tags

OpenGraph Site Name Entity

Websites Using OpenGraph Site Name Entity

Open graph site name entity tag

OpenGraph Type Entity

Websites Using OpenGraph Type Entity

Open graph type entity tag

OpenGraph Url Entity

Websites Using OpenGraph Url Entity

Open graph url entity tag

Open Graph Protocol

Websites Using Open Graph Protocol

The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook