SERP and Social Sharing Previews

Preview widget: Google SERP #8
https://en.wikipedia.org/wiki/Search_engine_results_page

Preview widget: Facebook sharing preview #7
https://developers.facebook.com/docs/sharing/best-practices#images

Preview widget: Linkedin sharing preview #6
https://developer.linkedin.com/docs/share-on-linkedin

Preview widget: Twitter cards preview #5
https://dev.twitter.com/cards/overview

Preview widget: Google+ sharing preview #4
https://developers.google.com/+/web/snippet/article-rendering