I have to admit, I knew they were an information mining outfit, so I kept my exposure low. But I didn't understand just how insidious Facebook was, tracking your browsing even after leaving the website, and keeping your information for 6 months after eliminating your account. Zuckerberg drew blanks when asked about that stuff, feigning lack of knowledge. The more he answered, the more deceptive he seemed, in fact he was not believable. My general impression of him is that he's pretty shady and untrustworthy.