Has anyone thought about using stenography to slip banned messages into image files on Facebook or has Facebook already taken steps to prevent this by stripping stenographed data from images files as they are uploaded?
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You are thinking of stenography (https://en.m.wikipedia.org/wiki/Steganography).
It could certainly be used to pass messages on Facebook, but only to those who know the key to revealing the hidden, likely encrypted messages. By then I fear you're just preaching to the choir if you're talking about waking people up. Now for below the radar comms to use Facebook while protecting your privacy, sure.