Putting anything in the internet and then deleting it doesn't guarantee that the info really gets deleted. Some body could easily copy the data and store it somewhere else without any one knowing it. So, deleting FB is really useless, the more important thing is not to put any sensitive info in it.
That's not the point. He wasn't suggesting deleting FB to remove the info you've already put up. He's saying delete it 1) to prevent putting up more (and more, and more) info and 2) because the company has gotten way out of hand, is not trustworthy, and is unhealthy.
In the United States even our government cannot listen in on a phone just because they feel like it. I think these things have to be resaid now and then or the youth may begin to believe the paranoid.
The government has been proven over and over to be doing things it shouldn't be doing. Yes, technically and legally it needs a warrant to listen to phone calls; however, the government doesn't follow its own laws, and has been caught doing so. Furthermore, they are known for asking, sometimes successfully, companies to put in backdoors or provide them data on their users, such as with Yahoo, Verizon, AT&T, etc. You seem to forget that these companies have this info, because people use them to communicate, and the NSA doesn't need a warrant to obtain said info if the companies just hand it over. And getting a warrant, if necessary, has, at least in the past, been relatively easy in many cases. It may be getting harder now with all the attention this stuff is getting, but I wouldn't count on it. And finally, when they do try to get info, they are known for casting wide nets and requesting info on many, if not most/all, of a service's users. It's not paranoia when it's been proven this stuff has happened and continues to happen, and IMO it's irresponsible to ignore all the evidence and (recent) past events to convince the "youth" there isn't anything wrong with the government and how they behave.