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How does facebook, gmail send the real time notification?

For example, I am on Facebook and I see this little notification being displayed that some one commented on a post I made. What is the technology used here?

Is it AJAX? If so how can data be PUSHED to the front using AJAX?

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Heshan Perera
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  • It's probably polling. Look at it in Firebug or Fiddler. – SLaks Sep 26 '11 at 13:11
  • Might be worth checking this out (it's related specifically to the email/messages/chat architechture): https://www.facebook.com/notes/facebook-engineering/inside-facebook-messages-application-server/10150162742108920 – Igy Sep 26 '11 at 13:27

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