In an email to members of its Amazon Associates program, Amazon.com started promoting Twitter integration for affiliate links. People have been posting Amazon links to Twitter for just about as long as Twitter's been around, but now it's an insanely easy two-click process, using the toolbar on any product page. This is good news for Associates, making Twitter a viable place to pick up some extra clicks and sales.

It's bad news if you hate product spam, though. Get prepared for a whole mess of folks starting up spammy Twitter accounts to take advantage of the new feature. Also get ready for well-intentioned friends who don't grasp Twitter etiquette to post some product links here and there. I'm not predicting a big storm, just a new minor nuisance.

The messages don't auto-post to your account, they just redirect you to Twitter.com with a pre-filled tweet. The text before the product names seem to rotate, and it includea stuff like "Great deal on," "Check out," and "Just saw on Amazon." I guess that'll make people who post frequent product links look a little bit less like spammers.