FB and many other "social networks" are pure spy networks ( as witnessed and confirmed by LifeLog DARPA project , which was shut down the SAME day when FB was created )  However - you saying the people shouldnt be using it ? I have actually met some people from FB in person , and we became good friends . It actually enabled me to met some people which helped me to change my life , literally ... so , to say that there wasnt any beneficial usage for me , would be utterly ignorant .  Ironically , if there wasnt for those spy networks - I would probably never be able to shift my life in different direction , because I would probably never meet those people in person , ever ...  So - there are bad things , and there are good things . Depends on people what they want to focus on .