Favstar.fm founder Tim Haines had a Twitter conversation with Twitter engineer Dan Webb, and found that Twitter is apparently moving away from hashbangs in its URLs.
Haines shared the conversation at a Storify link, but here are the relevant tweets:
Reading a gazillion articles on hashbang URLs (#!). 99% of them seem to be over-emotionalized FUD.
@timhaines read mine. It's all facts. danwebb.net
In that post, Webb writes (though he expresses that the opinions are his own, and not necessarily that of his employer's):
As you probably know if you’ve been reading this blog for a while, I have for a long time been an avid proponent of progressive enhancement and as many people correctly pointed out many of the arguments against hashbang URLs seemed to fold this philosophy in which clouded the issue quite a lot. In a well reasoned post, my colleague, Ben Cherry pointed this out and expressed that it wasn’t really hashbangs that were the problem and that they were merely a temporary work around until we get pushState support. As he put it, “It’s Not About The Hashbang”.
After quite a lot of thought and some attention to some of the issues that surround web apps that use hashbang URLs I’ve come to conclusion that it most definitely isabout the hashbangs. This technique, on its own, is destructive to the web. The implementation is inappropriate, even as a temporary measure or as a downgrade experience.
He goes much more in depth in the post itself.
@timhaines plus, now I'm in charge of undoing twitters hashbang URLs I can confirm that all the issues in that article are very real.
@danwrong x months from now (when your project completes) Twitter will no longer use hashbangs?
@timhaines correct. All gone. It was a mistake for several reasons. PushState or bust.
@danwrong You're going to revert to page refreshes if the browser doesn't support PushState? Adding PushState support progressively?
@timhaines although I'm not sure why everyone is so adverse to page refreshes these days. You can make them fast too.