Social networking services are in danger?

Hi Everyone!
What 's danger hide behind the common social networking service?
Do you think carefully before adding a new friend in your facebook or msn?
Please view the video below and discuss it:

http://www.youtube.com/watch?v=0lN2-Aoe0C8



Actually, social networking is widely connected with different people all over the world.
We can just simply clicking and follow few steps , you will "gained" one friend in you list. However, this is very unrealistic and it seems it is a dangerous game .If you agree to meet up somewhere with a friend who never meet before, it will be far more danger to know some stranger. And also, we as a society actually need to be stop to just only focus to the screen and talk with the strangers that you don't know through the online network.