I have some doubts about how earn these hats.
ask and answer your own question
I did a Selfie yesterday, but nothing happened
I earned this hat right now. I guess that this post woke up some process. As @ShadowWizard said You got Selfie due to the upvote on the question. :)
post an accepted answer that receives no other votes for 12 hours
I answered a question with no upvotes (accepted 20 hours ago), but I have not earned the hat (yet)
Is it just lag? Or are there other rules not written in the description of these hats?