Was in Tianjin and Beijing about 2 months ago.
Facebook is right out. Can't access it without a proxy, and using a proxy puts you at risk of being denied entry back into the country at a later date, though I don't know anyone personally who had this happen.
Google is hit or miss. It *usually* works, as do most of the sub-Google things (Play, Drive, GMail, etc), but sometimes gets whacked out for a few minutes by the Great Firewall. The whole "can't search for things on Google in China" thing is crap as well, Google from what I saw is uncensored (in English anyway).
YouTube does not work at all.
Steam barely works.
Origin does not work.
CP works
Most news sites work, but smaller things like Blogspot, or Blogger.com (or any affiliated sites) do not.