I do not know, or correctly wrote a question in the title. In general, the question is this. There is, for example, a widget fb commander, you can install it on your site. When entering, it will immediately show the active user facebook in this browser (if there is one). How is this possible? Does this widget on a third-party site have access to a facebook site session or what?

  • Add a link to the question to the question - Grundy
  • probably, to connect this widget, you need to install a script. Here he keeps track of everything - Dmytryk
  • one
    two options: the widget sends a request to facebook, in this case, the cookies are sent to your domain, and in the response received all the information to display, or iframe in which again facebook - Grundy
  • Checked This is a true frame. Thanks - antonin14d
  • learn.javascript.ru/cookie#- if- very very- qwabra

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