Zuckerberg stole the concept of Facebook...how can anyone be surprised that their information was stolen. It's certainly not the worst thing that Facebook has perpetrated.
"Researchers from Facebook and Cornell University teamed up to study 'emotional contagion'. Over a one-week period in 2012, they changed the content of news feeds for a random sample of Facebook users. For one group of users they removed content that contained positive words, for another group they removed content that contained negative words. They then measured whether subtly biasing the emotional content in this way changed the emotional content of status updates by the users. Sure enough it did. Making feeds more negative led to more negative behaviour, and vice versa."