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Facebook insurance is when you and your friend fake like each other's posts just so you both don't look like total failures. It's like giving each other a slap on the back when you both fall flat on your face.
You post 'I ate 12 tacos and now I'm crying' and your friend comments 'That's the worst thing I've ever seen' just so you don't look like a loser.
Your friend posts 'I failed my math test' and you comment 'Same' even though you aced it.
You like your friend's post about their pet goldfish winning a competition because you know they'll like yours about your failed relationship.