Ooh, hyper-modern ethics questions! My favorite. "I went to high school with a girl who I came across on Facebook. She's clearly got an eating disorder. What on earth do I do? I can't just friend her, and say, 'Hey! We went to high school together twelve years ago and I just found your profile, and you need some help! Go Bulldogs!'" That would be amusing. But one answer for sure is of interest.
"Do you stop women on the street to deliver critiques of their body weight and diagnose them with eating disorders based on your total non-knowledge of their situations? Would you want that sort of intrusion on your own person from strangers?
Don't do it on the Internet."
What's this crazy idea about acting on the Internet like you do in the real one? I must go away and think about this.