Would it be unethical if I broke into your house to randomly place pieces of candy and $5 bills in your drawers?
Every single company in the world knows very well that 99.99% of their userbase won't read the ToS, and use this to do whatever they want with their users' information and privacy.
There needs to be dramatic improvements in that area.
http://www.ftc.gov/news-events/press-releases/2011/11/facebo...
Would it be unethical if I placed candy and money around my own house, invited you into my house, and told you to take anything you desire?
Your FB profile is not your house; it is just some data you have shared with FB. FB decides what to do with the data: how to share it, where to share it, when to share it, who to share it with, etc.
Everybody knows that FB _already_ manipulates the feed to change your mood: to make you more engaged with the site; to make you click more on ads; etc. It's been doing this basically for ever.