"If you don't use Facebook we will still collect[1] and sell all the data about you we can"
"But I never agreed to that."
"Too bad."
Under what circumstances would you describe that as consensual?
And that's not even getting into the concept of _informed_ consent; something that they clearly don't have given the amount of user anger that gets directed at Facebook every time when a new leak/breach/data collection method is revealed.
[1] https://news.ycombinator.com/item?id=5921092
In addition to the fact that they collect information about people who don't join Facebook (and agree to the ToS) by virtue of the information that others (often unwittingly) submit to Facebook, like group photos, mobile phone address books, etc.
