Is it legal to copy Stack Overflow questions and answers?
They seem to have respected all of the criteria except:
You will ensure that any such use of Subscriber Content visually displays or otherwise indicates the source of the Subscriber Content as coming from the Stack Exchange Network (Stack Overflow, Meta Stack Overflow, Server Fault, or Super User)
I'm not sure if there is a centralised question for reporting this stuff (ok, I thought there was, but couldn't find it in the limited time my patience lasted)
EDIT it says StackOverflow on the home page, but not elsewhere (except implicitly in links, or 'encoded' in the logo at the top)