Add og: stuff for social network integration

assigned to @Artemix

closed

removed To Do label

reopened

added Doing label

removed Doing label

Stalled.

OG protocol support can be nice but:

1. The XMLNS definition file is served over http and needs facebook auth.
2. The only available checker is hosted on facebook and requires an account. Since I refuse to have one and to use their services, I simply cannot verify and test the og syntax.

closed

reopened

closed