LiveInternet - крупный сервис дневников и сообществ, авторитетный сервис статистики для сайтов.
Mail.Ru Group is the largest Internet company in the Russian-speaking world and the leading Internet company in Russia, based on global monthly unique ...
See what your Facebook friends have liked, shared, or commented on across the Web. This includes all variations of Like, Share and Follow Buttons, Embedded Posts, Comments, Activity Feed, Recommendations Feed, Recommendations Bar, Like Box and Facepile.
The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook
A canonical link element is an HTML element that helps webmasters prevent duplicate content issues by specifying the "canonical", or "preferred".