Yandex.Maps API. Use Yandex maps for your web site or application. Create custom maps, directions, and geoinformational services.
Facebook's Like button is the quickest way for people to share content with their friends. A single click on the Like button will 'like' pieces of content on the web and share them on Facebook. You can also display a Share button next to the Like button to let people add a personal message and customize who they share with.
Open graph description entity tag