> Don't assume that Facebook will pick good over evil

The first step is to realize that there is no such thing as good or evil, just what like-minded people choose or have been conditioned to see as good or evil. So saying that "Facebook will always do good and/or avoid evil" doesn't even make sense. Good according to whom? Evil according to whom? And since there ARE differences of opinion in those definitions, it will at some point be the case that whatever Facebook does do is something YOU would consider not-good, maybe even evil, even if the people who make up Facebook's decision making process legitimately think they are doing good. So you don't even have to be pessimistic or cynical for this argument to fall flat.