It's probable that some of your #Facebook friends aren't using their real names. I know some of mine aren't. Guess what? Facebook wants you to snitch on them, as this dialog box shows:
Why is Facebook doing this? The reason they give is:
Facebook is a community where people connect and share using their real identities. When everyone uses their real first and last names people can know who they're communicating with. This helps keep our community safe.
This argument is bollocks, because anonymity often enhances safety:
What Facebook really thinks is "We require real names so we can monetise you more easily. You're our product, not our customer."
So what can we do about it? One possibility would be if everyone, when asked this question, adopted a policy of:
If enough people did this, it would create enough false positives and false negatives to make problems for Facebook's automated snitching software.