Just because I can only have a few meaningful relationships doesn't mean that I don't like to keep track of what's going on in the lives of my friends and family that I've met over the years. That's a great service.
Yes Facebook does bad things from time to time, researching what days of the week teenagers are most likely to post given content does not, in my mind, qualify as an especially nefarious action.
Yes Facebook does bad things from time to time, researching what days of the week teenagers are most likely to post given content does not, in my mind, qualify as an especially nefarious action.