How does Facebook Ajax work? 2-3 months ago they were using # but now the whole addressbar is changing.
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The first approach used is called “Ajax Crawling” (also refer to this answer).
But I think the new approach you are talking about is just the HTML5 History API. Github is using this approach for their tree browsing, and you can learn more about it here. (I recommend ALL readers to read and watch the video as it’s very informative)
EDIT:
Just to point out that Facebook is definitely using the HTML5 History API (direct link from the previous github article).