Purple floppy bird
It's a floppy purple bird gif otherwise known as a trash dove. People leave it on comments on Facebook to imply that the person making the comment is being ridiculous. They might be virtue signaling or spouting some political correct nonsense. The person who is making the insane liberal comment will simply think that the person is agreeing with them, but it is a symbol to others viewing that a moonbat rant is happening.
Look at this person and their insane regressive left comments. I'm just going to leave a Purple Floppy Bird trash dove gif sticker here to let other normal people know that this person is an idiot.