Can my employer spy on my facebook and share it around?

[FortuneFox.com]

Recently I was told of an email that was circulated to all senior Executives and Directors of the company I work for that contained a screenshot of my Facebook wall.

The email was specifically sent for the purpose of sharing details of my wall - in particular a comment made by one of my friends (which by the way did not mention my company)

My privacy settings mean that only my friends can see my posts/status and furthermore I cannot be searched or have people see any photos I am tagged in. Therefore I would maintain that I have a very high standard of privacy attached to my Facebook.

Obviously someone who is friends with me has taken the original screendump to executives at my company - but is it a breach of my privacy to then share it around my workplace with people who are clearly not on my "friends" list?
Just to clarify, I am on 12 months leave from work (and I don't use FB at work anyway as I'm one of the few who are too busy working!) and all this went down while I'm not even there. I found out when a 3rd party phoned me to advise what had happened.