Facebook has acquired the anonymous social networking app tbh for an undisclosed amount, and intends to continue to operate it as a standalone app. The acquisition was first reported by Techcrunch Monday, which put the acquisition price at around $100 million.

tbh allows users to create polls based set questions, including “who makes you laugh the hardest” and “who has the best smile.” Users then select up to four contacts from their address book. The sender of the poll remains anonymous, unless she or he decides to reveal their identity.

The use of pre-formulated polling questions is meant to discourage bullying, and the formula seems to work for tbh’s target audience of teenagers: The app has been downloaded over 5 million times in recent weeks, and has frequently been topping Apple’s charts for top free iPhone apps.

Facebook said in a statement to media that the two companies shared the common goal of building communities: “We’re impressed by the way tbh is doing this by using polling and messaging, and with Facebook’s resources tbh can continue to expand and build positive experiences.”

tbh’s team will work out of Facebook’s campus going forward, but continue to operate the app independently for the time being.