[gundisclosed]

“most people haven't read the Facebook terms of service and it is probably unreasonable to expect everyone to not only read them”

I completely disagree with this thought process. If a website is asking your birthday, every like / dislike , every detail about relatives and is able to predict if you like someone even before you do .. you better know how they will use all this data.

[Karunamon]

Strictly speaking you're correct, but you're describing the should rather than the is. There are too many overly-long ToSes written in arcane legalese to do mundane things like use a website or play a game for the average person to comprehend even the fist time for everything they use, let alone keeping up with the changes and their implications.

To coin a meme: "Ain't nobody got time for that"