My worked started blocking it, which totally pisse me off at first. And when I get home, there are so many status updates I can barely follow them. So I mostly stopped using it, and you know what? I hardly notice.
I know this is off topic, but your "work" is stupid.
Not only is motivation more important than some time "lost" due to FB usage.
If you cannot get some of your private stuff during work hours, chances are you are going to leave earlier or come in later.
Lastly it is ineffective, you can always "stunnel" via port 443; they would be none the wiser.
First, unfortunately it's too late for me to go back and fix the typos above (HN + iPhone = errors), so my apologies for that.
And second, I agree with you. It's not that I checked it that often in any event (if they really wanted to prevent time wasting distractions, they'd block HN ;)), and if I want to, I can always check it via my iPhone/iPad, etc...
I suppose my overall point was that, even though the no-Facebook policy is inane, it ended up with a result that for me was fairly benign, which suggests that Facebook's value in my life was fairly low.