"Users won’t see more ads on Twitter, but they may see better ones," wrote Twitter's Senior Director of Product and Revenue, Kevin Weil, touting the change as a way to make the service "more useful" to users.
Privacy-minded folks won't be too happy.
Advertising Age has more. A positive note for privacy advocates: Twitter offers you opt-out with this stuff; Facebook doesn't.
As Twitter's official announcement explains, you can avoid the increased tracking/targeting by simply checking off a couple of boxes in your Account Settings, and by enabling Do Not Track (DNT, not DMT) in compatible browsers.
Here's how to opt out, if you are so inclined:
1) Log in to your Twitter account.
2) Under "Settings," uncheck the boxes shown above.
3) Enable "Do Not Track" in your browser (FF, Chrome, IE are all compatible).
4) Follow @boingboing. Hah, I made that part up! But please do.