Eben Moglen in Freedom in The Cloud (around 24:50):
The human race has susceptibility to harm but Mr. Zuckerberg has attained an unenviable record: he has done more harm to the human race than anybody else his age.
Because he harnessed Friday night. That is, everybody needs to get laid and he turned it into a structure for degenerating the integrity of human personality and he has to a remarkable extent succeeded with a very poor deal. Namely, "I will give you free web hosting and some PHP doodads and you get spying for free all the time". And it works. Transcript.
The spying can happen, because Facebook (as is much of the internet) isn't decentralized. All information of all (or many) people is collected in one place.
There is no architectual reason for all information to be in the same place. There is no reason for all weblogs or email to be on servers that are controlled by one company.
I host my own weblog. It's not very hard. It's just a web server and some files. It could be easier and much of the rest of the video is about how to accomplish a decentralized version of the services of the internet.