I'm tired of this example. AFAIR, Yahoo got a valid court order to turn over information, and they complied because they had a presence there. No other company: not Google, not Microsoft, not AOL would have done anything different.

Twitter might have, if they had a presence.

They had this sort of issue in France a while back didn't they?

Yahoo! responded to being put in this situation by, among other things, funding a fellowship at Georgetown (and Stanford I think) for a researcher and 2 students to study human rights issues and communications policy related to the internet: http://isd.georgetown.edu/programs/yahoofellow/