top 5% of users generate 75% of activities.

another way the social web can be used for businesses.

Happening as predicted. Nice explanations of what to expect.

I wonder the shortening service provider is in the best technological position to implement some anti-spam measures. They can perhaps cooperate with anti-spam email scanning services. Is financial cost okay for that?

At the same time, I wonder if these services will really be used that much. If you use one shortened email for all your spams, you lose the chance to get a tricked reader to your site at once when the url shortening service disables the redirect. But if you want to distribute your urls across many different shortened urls, you as a spammer run the risk of being a suspiciously heavy user of shortening serve.

Is this a form of paid posting?