You know what causes a real ecological disaster?
Washing Machines.
Yes, FUCKING washing machines.
They use too much of one of the worlds rarest resources (clean water), contribute to global warming and pollute the waste water with phosphates.
On the other hand, they have freed up half the worlds workforce from backbreaking manual labor and contributed to society enough that no less than Hans Rosling calls them the greatest invention of the industrial revolution[1]
Facebook allows companies to sell advertising and allows law enforcement to track you.
On the other hand, it allows quicker and easier communication than ever before, and contributed to the Arab Spring to the point where the revolutions in Tunisia and Egypt are known as "the Facebook revolutions" [2][3]
Convenience has costs, but who is Moglen to judge if those costs are worthwhile for everyone?
[1] http://www.ted.com/talks/hans_rosling_and_the_magic_washing_... (watch this video - it's really good)
[2] http://www.theatlantic.com/technology/archive/2011/09/so-was...
[3] http://www.technologyreview.com/web/38379/
Edit: To all those claiming this is a strawman - it's not. Moglen failed to point out the benefits of social networking, and I'm using an analogy to show that most things have costs and benefits. Please don't get distracted into an argument about that.
I'd love to see people try and explain how Moglen is right about Twitter (which has much lower privacy costs than Facebook).