Does Facebook read your texts for advertising purposes?

My mom sends me once in a while one of those pointless math questions where x,y,z are replaced with apples and bananas and you solve a straight forward equation to get them. So a couple of days ago, as a joke I grouped a few of them and sent them, via Whatsapp, to my friend to annoy him. Now my entire Facebook feed is full with those "riddles" as "suggested for you" .

I tried to come up with any …

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