On Stack Overflow, I logged in just now and noticed my gravatar was changed to my Facebook picture (using Firefox). I never changed it myself and thought it was strange, so I changed it back. After that, I launched Google Chrome and logged in again from there, and my facebook Picture was there again instead of the Gravatar. I have no idea why this is happening, but wanted to report it here.
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We intended to do this for Facebook users only when they first login (as facebook.stackoverflow.com did) - that logic wasn't correct. A build is rolling out now to ensure it only happens on user creation (not every time you login). You can unset/change it once in your profile if you don't want it, and it'll stick once the profile (since it won't even try to set it again).
A build is rolling out now that will behave correctly - give it a few minutes.