Filtering sites won't make workers more productive

Amazon
So your employees are shopping on Amazon at lunchtime. At least they're around to answer the phones

"Research reveals that 60% of all online shopping happens at work," said the press release in my in-box.

"That's nice," I thought, "I'm glad employers are enlightened enough to understand that this sort of casual borrowing of company resources is good for morale and hurts no one."