My 2 cents:
Memes are harder to intercept: the text is not directly readable by bots.
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Q asked for memes since January 2018, or earlier.
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In September Facebook announced AI to combat "offensive" memes
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The European Union launched a law against memes (the photo's might be copyrighted)
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Possibly related: you cannot easily copy pictures any more in Twitter on Chrome etc. since September or so