Technology used by facebook

In a while i've been asking myself what technologys facebook applys to autoupdates, when you look it seems ajax, but every part autoupdate, when you make a comment or a friend makes a comment it autoupdates, when a friend makes a post it auto updates, so i´ve been wondering it´s ajax, or something else? and if ajax/javascript, why doesn´t the client soffers with slow navigation? because continuously query to their server it´s ok, they can affort, and handle. There´s been a while since a have been wondering about that.
pep477Asked:
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Dave BaldwinFixer of ProblemsCommented:
This page tells a lot about it: http://developers.facebook.com/opensource/
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