Caught by fake Facebook account

I got caught out by a "friend" with a fake Facebook account the other day. Normally I avoid this because I look at friend requests to decide if the person seems believable.

• Does the information seem consistent? Someone from Australia who went to a Pakistani university and lives as an Iraqi goat herder raises questions
• Do they have a history? A lot of fake accounts only go back a few days
• Why should they know me? Although they mostly fail the history test I've had a few friend requests from US soldiers in Afghanistan.
• Why should I believe a new account for an old friend is genuine?Some possibilities
  • A new photo that wasn't on the old account is good.
  • Has the old account continued posting?
  • Failing which a private message to the old account can be enlightening.

In this case I couldn't even remember accepting a "friend" request from this person, but suddenly a private message quickly followed by a photo of their manhood. This was my first on Facebook and it took me a to realise what I was looking at. Instantly unfriended and blocked, but ????