Why do guys add random girls on fb or follow random girls on Instagram if he doesn't know them?

Anonymous
My boyfriend has a lot of fb friends that are girls and also follows mostly girls on Instagram, but he said he doesn't even know them. If he doesn't know them, why would he add/follow them If he's not going to talk to them?
Why do guys add random girls on fb or follow random girls on Instagram if he doesn't know them?
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