Here's an example where neither person is wearing glasses.
https://twitter.com/LOVEMUNY/status/1307789227535499266
It also includes an example where the black man is wearing glasses and the white man isn't.
https://twitter.com/LOVEMUNY/status/1307789227535499266
It also includes an example where the black man is wearing glasses and the white man isn't.
One theory is it's actually the glasses increasing the likelihood of correctly identifying a face (or "feature" element in the photo). Interesting looking through the various tests in the thread, as clearly lots of variables here, but no way this will be exhaustive.
Suspect this might kick off some serious arguments at Twitter HQ for allowing users to pick the cropping vs. an algorithm regardless of any bias found one way or not.