My [22 F] boyfriend [29 M] is following underage girls on social media. Am I being paranoid?

Not as far as the law's concerned.

Read about age of consent.

The only people I've seen nitpick the difference between ephebophilia and pedophilia

It's not nitpicking. From a legal standpoint, ephebophilia is mostly legal, albeit creepy as fuck and frowned upon in western society. Pedophilia is universally condemned. If you don't know the difference between these two things, how about you don't go accusing people on the internet whom you have absolutely no info about of normalizing creeps? Get off your high horse.
I've pointed in my OP and in a follow-up comment that the guy's behaviour is not okay, there's no need for you to go around virtue signaling and bolding words to try and take the moral high ground. This difference needs to be brought up because if OP's boyfriend was following/buying/creeping on kids below the age of consent, it would be a crime and she would want to report it. If it's teens, she might not want to do it because it's not technically illegal (albeit, weird as fuck, as I pointed out several times), especially if the teens themselves are sharing the pictures on social media.

/r/relationships Thread Parent