Shared publicly  - 
people ask me semi-personal things via facebook and email a lot in terms of what i don't say about myself. this is especially common for non-westerners for some reasons (their names and usage of english obvious indicators). i know people are curious, it's human nature. but if i omit, it's cuz it's none of your business. though the few readers of my weblog that i've met are strangely always shocked when i mention stuff which has never shown up on the internet in regards to my life.
Gordon Wells's profile photoRazib Khan's profile photoRandall Parker's profile photoClark Goble's profile photo
ha, try being a brown female. tons more personal emails, tons more requests for photos or worse. almost all of it courtesy of non-western males :S
This is only an observation of one, but I feel the design of facebook encourages this. I think displaying every minor interaction with others encourages a level and kind of openness that is unhealthy. You can tidy up your end, but for the most part the environment is the same.
gordon, i don't post anything personal on fb. just an fyi.
I never get asked random personal questions by strangers, but I do get hit on. Go figure.
Razib, I figured as much. But on most people's walls every previous interaction is recorded by default (I believe this has been replaced by the ticker now). I think this creates/nurses certain expectations.
Are we going to develop a single world standard for what's proper to say and ask?
Randall, I suspect that we will eventually. Just as regional differences are present in the US but slowly are converging.