Most of the teens we talked to wouldn't acknowledge having fake Instagram ("finsta") accounts.

U.S. Republican presidential candidate Donald Trump poses for a selfie with a young audience member onstage at a campaign rally in Portsmouth, New Hampshire January 16, 2016. REUTERS/Brian Snyder

For the uninitiated, a finsta is a portmanteau of the words "fake" and "Instagram." You use it for posting embarrassing or less aesthetically pleasing pictures you wouldn't want to share with all of your friends.

Eighty percent of the teens we talked to had no idea what a finsta was, and 92% said they didn't have one.

"I did have a finsta with a friend, but we don't use it anymore because it got too confusing to know which account you were on, to make sure we were posting on the right one, and not posting on the wrong one by accident," one 16-year-old told us.

"A lot of my friends still have them and use them. A finsta is a fake Instagram account people use to post funny pictures they wouldn't normally post for everyone to see. Usually on a finsta you only have your closer friends follow, so you can post embarrassing pictures of yourself without having everyone you've ever talked to see them."