We used to have NN at work. God forbid a dispatcher use some downtime to look at dancing cats.... hahaha
It worked really well, internet was basically useless.
I used to get a lot of requests from parents for recommendations for effective parental control software that wouldn't render the computers useless. I told them that there was no such thing. Instead, I suggested that they use their eyeballs. Put all the kids' computers in the family room or some other room where they could be supervised, connect them through a wired router, and disable WiFi.
I never ceased to be amazed by the anger that suggestion provoked, nor by the reasons behind it. "But my children want computers in their bedrooms," was a common one. Yeah, I'm sure they do. And the people in hell want ice cream. So what?
The corporate world wasn't much better. They wanted software that would allow their employees to visit every possible site that they might need to access for work reasons, but to be blocked from every possible site that they had no work-related reasons to visit; they wanted it to be individualized for different employees; they wanted it to require no intervention from management; and they wanted it to work perfectly. And oh yeah, they wanted it to be free or cheap, too.
Such software not existing in any world that I know of, I would block the more notorious time-wasting destinations and services at the gateway. This would bring about a whole new set of "wants" from the employees, who believed that they had a "right" to spend their days checking their social networking sites, chatting away on IM clients, reading their personal email, downloading music, remotely monitoring their nanny cams, doing personal shopping, and basically doing anything else besides working.
The bosses, not wanting to take responsibility for the measures that they had instructed me to implement, would blame me and give the employees my number; and so I had to deal with calls from their employees threatening to sue me for violating their "constitutional right" to goof off.
I don't remember reading about that right, but I've heard about it so many times that I guess it must be in there somewhere. Maybe it's in the fine print.
-Rich