they're just a set of accts/feeds you make that someone can follow when they join. but everyone seems mad that they'll be used for NEFARIOUS FOLLOWING. like who cares. they seem encouraged as a way of starting specific communities like "brands" and "nerds who love brands" so that sucks but wgaf.
i tried to make another account just to follow art stuff because every single feed is full of noxious pornography but it was actually very hard to start a new account and find stuff i wanted to find so it's probably a good feature! you can also use it to stalk and attack people you hate?? somehow??