And yet you haven't corrected your original post, I have read it, believed it, and told everyone I know that the nice green leaf is propaganda.
Modern life demands critical thinking skills.
Not really. Being mistaken is not the same thing as being defamatory. If someone is honestly just incorrect, and you go parroting what they said without independently verifying (especially if the person is a pseudo-anonymous internet commenter and not a subject-matter expert) then frankly that is entirely your fault.
Being intentionally deceived is another matter.
There was 4 hours between the original probably wrong post and yours.
Did you really manage to spread to everyone you know in that 4 hours that the nice green leaf is propaganda? Why? It sounds at most like something I might drop in passing conversation, not something I would attempt to broadcast when first told of it.
on edit: having read further down I see that the probably wrong is actually wrong, it was definitely a joke issue.