I believe people quickly know what works and what does not, even without directly being aware of it. If a woman wears a new type of lipstick, the signs that it

I believe people quickly know what works and what does not, even without directly being aware of it. If a woman wears a new type of lipstick, the signs that it is working or it is not working are very subtle, but over a few days, she will understand that it's not working. She will then change to one that works a little bit better, and when she tries one (recommended by a friend) she will see other subtle signs it works. It's the same with profile pics - the girls cycle through many different pictures and there are subtle vs not so subtle signs that a picture works better than some other one. To be introduced to that particular style, one has to see it somewhere, and as it becomes widespread, you get to see it more and the chances of you trying out increase.