Should I stop posting from work?

[Cadaverous Pallor]

Just got this internal work email. It was sent to everyone, not just me.

JUST A REMINDER

"E-mail and Internet are to be utilized for work related purposes only. All non-work related use is stricly prohibited. The computers and E-Mail system are owned and maintained by the City of <blank> and may be used for city business purposes only".(City of <blank> Administrative Manual)

Thank you for adhereing to this policy.

A little bit of backstory that you may already know: In the past they have never hassled people for this, even though it has always been the rule. Even my technophobe boss can be seen reading gossip columns online. Things get very slow at the branches.

The city has closed down the big library and there are lots of us crammed into the two tiny branches with nothing to do. Just this week they've told the part-timers that they have to cut their hours for a while, because there's nothing to do. (Happily, I'm exempt from that.) They also apparently came down on a coworker of mine that loves to tell long loud stories in the back office and laughs way too loudly. All of this is audible to patrons, making us look bad.

My current worry is that the really are cracking down on things like this because patrons may notice, and as usual, it's their tax dollars paying us. They are extra worried about public opinion due to the closure of the main library.

Having said that, I'll reiterate that everyone here uses the net for fun. No one has said anything in person, and the person who sent this is an administrative/secretarial type who doesn't work at this location. If I just keep it to times when I'm sitting on desk with nothing to do, I think I'll be ok.

What do you guys think? Especially those of you who've done managerial jobs before, what do you think of the tone of this email?