Since it's pretty popular to use dating apps and websites these days, I think this is an interesting question. Which things make you think the other person is lying or catfishing you online? Or do you not believe in catfishing? (Catfishing = pretending to be someone else or hiding things about oneself online, for example using someone else's pictures.)
Most Helpful Guy
So easy to pick up on girls that aren't legit on dating apps.
If a girl 'likes/favourites' you it's a dead giveaway cause its an attention seeking behaviour that isn't needed for a girl to get tons of msgs.
Or if they try get you to message off the app quickly its because they're trying to 'sell you' nudes/videos where moderators won't be able to take their profile down.
Only having revealing photos is also another one (again, attention seeking behaviour that girls don't need to attract)
And on PoF I've noticed fake profiles have an underscore in the middle of their profile name followed by jumbled letters in upper and lower case that make no sense. E. g. Sexylegs_xXob00
Most Helpful Girl
When they look like a Instagram model.
They're a muscly dude holding a puppy.
And they never want to meet or phone chat.
These are 3 big ones and so far always been correct lol.0