And yes, of course there should be pr0n blockers at work for obvious reasons, but why keep people from noodling on social sites, it's basically a water cooler, management just doesn't like it because a water cooler is obviously wasting time, facebook is less easy to spot.

• We can't spend 4 hours hanging around the water cooler (or maybe we can?).
• At the water cooler we usually gossip about work itself, not about how Johnny Football's status was recently changed from "in a relationship" to "single and looking".
• I'd sooner allow porn sites on my network than Facebook. People can spend all day wasting time on Facebook because the flow of updates is steady. On a good porn site, though, I'd last 10, maybe 15 minutes, then get right back to work.