If you share a car with 10 people is it yours? well you might say its partially yours, maybe even 10% yours.
what about your local park? would that be yours... you use it? its partially yours maybe you own 0.0000001% of it? still yours?
So suppose you have some personal information about yourself. its only 'yours' and personal because its private.
suppose it becomes public information, its still your information, but somebody else also has something about you... knowledge if you will. 50% YOURS!
what im getting at is...
FACEBOOK
people are sharing so much, where they are, what school they go... when they work, how much they earn, even personal details about there lives.
Its become an essential tool for everything. every advert on TV now has a little facebook like button on it..
take for example the picture below...
Your telling everybody what you like, where you go, everything about your life... why would somebody even want to share all this?
stop being one of these...
and become one of these...