The Washington Post recently profiled a 13-year-old girl and focused on her social-media use. She explained that on Instagram, a "tbh" is used to say something nice about your friends.
"[This girl] gets so many likes on her pictures because she's posted over nine pictures saying, 'Like all my pictures for a tbh, comment when done,'" she told The Washington Post. "So everyone will like her pictures, and she'll just give them a simple tbh."
While "tbh" still means "to be honest" or sometimes "to be heard," it's no longer associated with an insult ("I'm just being honest!"), but with compliments. In The Washington Post's example, the teen girl, after getting her likes, would then write a simple "tbh you're pretty" on commenters' pictures.
A tbh is almost like an Instagram currency - you can trade a tbh for a like on one of your photos.
Via a tweet I received with the acronym TBH, after wich I googled it and found this story.
More of this story at this link: https://www.google.com/amp/s/amp.businessinsider.com/what-does-tbh-mean-2016-5