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Digg can avoid pissing people off with this by adding their own framebuster. If the frameset's HTTP referrer is Digg, then the DiggBar is a potentially useful toolbar. If the referrer is something else, it should redirect to the original page.

Minor typo:

"Here’s the problem: If your site ends up on Digg, visitors using the Diggbar will not visit your URL"

The italicized "not" is omitted in the actual article.

What about the Facebookbar? Why is no one complaining?

Even reddit has one; it's just disabled in the user's settings by default.

Defaults matter.

I guess the Facebook's main goal it's not to provide links to external sites where the real information is.

Also, Facebook's bar does not pretend to be a URL shortener to get links and increase it's own traffic.

Ironically he isn't blocking the diggbar.

The Evil Diggbar