"Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity."
I'd argue that we should simply flag accounts as hackers, thereby, by definition, greenlighting anything they post, except I wouldn't be one of them.
Do you think I should submit this link?
http://en.wikipedia.org/wiki/Isaiah_Berlin
(I read it today to satisfy my intellectual curiosity.)