Zuck is tricked by a satire entry meant to mock Facebook's AI shortcomings.

If he can fall for this, countless uninformed voters around the world could also be misled in the moments before crucial elections. 

Or perhaps he's playing dumb 😉 effectively demonstrating a business case on how his company’s tool can be leveraged (or read abused). Bad publicity is good publicity. 

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Mark Zuckerberg ‘Loves’ AI-Generated ‘Challah Horse’ On Facebook
forbes.com

What if this by itself is fake news? 

Seems like Forbes and others picked it up so there may be some credibility to it. Never heard of 404 media before. 

According to 404 Media, the Challah Horse originated from a Polish news outlet called Donald.pl, which satirized Facebook’s flood of AI-generated slop by posting the image with the caption, “This woman baked a challah horse but no one congratulated her.”The ironic post was inevitably reposted in earnest by spam accounts on Facebook, and the Challah Horse post that Zuckerberg “loved” came from Faithful, a verified page with 1.1 million followers.