http://oi45tmbel5syg4uet4t2fg6ipfu22ewfb4dfgpeckarn3qtv3pwq.b32.i2p/tips.html
A different but related threat involves the actual time when you're active, which (typically) gives away roughly which part of the world you're in. What I could do: forging file timestamps would be snake oil, but I suppose I could have a system where uploaded files are hidden for a random interval before being published, or are published daily at an arbitrary time.