I received this lovely letter from Facebook's lawyers earlier today. The key points are transcribed below:

"Dear Mr. Finke:

I am writing you concerning the Firefox extensions you posted at:

1. www.chrisfinke.com/addons/facebook-image-to-email and
2. www.chrisfinke.com/addons/facebook-scavenger

These plug-ins are deeply concerning to Facebook because, among other things, they violate Facebook's trademark rights, its Terms of Service, the security of the site and Facebook user privacy. For example, the facebook-image-to-email extensions permits people to circumvent Facebook security measures that protect user privacy and the scavenger extension allows people to harvest data off the site in contravention of the Terms of Service and also infringes upon user privacy. [...]

I insist that you immediately take down the extensions listed above. [...]

Sincerely,

Mark Howitson
Deputy General Counsel"