This instrument is very useful especially for teenagers. I think that social networks have many advanteges, but as everything else, they also have disadvantages.
For example when you meet somebody, you do not know anything about his problems.Sometimes he pretends to be the person you think he is and he is not.
Then the best advantages is that you can say what you want to who you want and when you want, providing that person has joind that network.
The worst thing is if someone puts on your password and then he goes chatting with other people as if he was you.
Finally I think that this can be very good if you use social networks well.
