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?

Updates:

[SpicedPumpkin]

In my experience they add you and then send creepy messages and ask for phone number, pictures, etc.
This may not be the case with him though so try not to worry, just keep an eye out I guess. Maybe they requested him and he just accepted to be polite? Do you know for sure that he was the one to request and not them?
Do the girls have a ton of friends? Some people just go around adding random people.

[Esplorare]

They have sad self-esteems and use those profiles as a consistent ego boost.

[Succcesssfulll]

So they can follow back or because he thought they're cute.

[Klaatu51]

they wanna masturbate with their pics :p

[Riri5129]

Probably to make him look popular

[emerald77]

Lots of guys do that.

[front2back]

Cuz they're cute.