What's going on with Youtube in China?

Everybody would like to know! Starting from last night, Youtube.com has been having intermittent issues all over the country - yet, because some people can't get on while some people can, it's hard to say whether we've all been great firewalled again (which happened last time around politically sensitive dates) or whether it's just some strange China-only technical glitch.

Links:

• @davesgonechina has made a map referencing all the youtube outages
• Danwei is iffy about the block. Is also iffy about Twitter. Is Danwei actually Jon Stewart?
• Whatever, that's not stopping the twitterati from twittering the crap out of this.
• Someone thinks this has to do with the 50th anniversary of the failed Tibetan uprising. Possibly, but why the arbitrary not-countrywide blackouting?

Previously on Shanghaiist
Youtube blocked in China, Tibet content likely to blame
Youtube remains blocked, but nobody seems to care
Give us back our Youtube!
Blogger reactions to the Youtube block and other weird stuff happening