Different structures supported by the major social platforms:
- Twitter Cards: Summaries, Images, Galleries, Apps, Video, Audio, and Products
- Pinterest Rich Pins: Products, Recipes, Movies, and Articles
- Google+: Articles, Blog, Book, Event, Local Business, Organization, Person, Product, and Reviews
- Facebook: Articles, Photos, Audio, Video, and more
https://developers.facebook.com/tools/debug
https://dev.twitter.com/docs/cards/validation/validator