OpenGraph/TwitterCard meta tags

[beniwohli]

the detail template should have opengraph and twittercard meta tags to make sharing posts more appealing.

https://dev.twitter.com/docs/cards/markup-reference
http://ogp.me/

[beniwohli]

For the respective URL tags, the language prefix should be removed from the URL to make sure that e.g. like counts are aggregated over all languages and not split up.

[darioalbanesi]

here is an explanation and some good examples on all must have opengraph meta tags for google+, fb, twitter, etc..
http://moz.com/blog/meta-data-templates-123