A bro PM'ed me recently about finding FLs on Locanto & Skokka - told him majority of ads are fake n sometimes hard to tell.
Basically you gotta do reverse image searches of images, check phone number etc - it's a bit time-consuming so I just dun bother.
Then sometimes its so stupidly easy to spot - like this ad - claims to be a Japanese girl named Yumi, but images of Thai celebrity Mook Pichana - you can even see its taken off the legit Instagram account! Lol.