A．People can tolerate the private information sharing within the social norms.
B．People are still too conservative to share their private information.
C．People tend to keep up with the change of social norms on privacy.
D．People have tolerated well when their private information has been shared.
A．upgrade their service to adapt to customers' needs
B．ask customers to pay more for their service
C．provide more entertainments for online users
D．persuade users to give up rights on privacy
A．They intrude people's privacy under tricky disguise.
B．They endeavor to change people's ideas on privacy.
C．They frighten people to give up some privacy.
D．They take serious responsibility for people's privacy.