guardian/frontend — pull request #4219 by phamann (2014-05-14 10:22:05+00:00)
Title: SEOL refactor og tag metadata

This refactors the OpenGraph tag metadata to use a comma separated array of the content keywords, instead one single tag.

https://developers.facebook.com/docs/reference/opengraph/object-type/article

/cc @gklopper