The tbh team wrote in an announcement post that "When we met with Facebook, we realised that we shared numerous same core values about connecting people through positive interactions".
One of the friends (they have to have also downloaded the app) are notified when they are selected, but the details of who chose them is kept anonymous. The app has notched up to a whopping 5 million downloads and 2.5 million daily effective users over the past nine weeks with its app.
Facebook has locked its sights on teens around the world with the purchase of tbh, a polling app that has been a huge hit with under-twenties.
Financial terms of the deal are still wrapped under suspense, but TechCrunch mentioned in a news feed that according to them the deal closed below a figure of $100 million and won't require any regulatory approval.
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"TBH and Facebook share a common goal - of building community and enabling people to share in ways that bring us closer together", Vanessa Chan, a Facebook spokeswoman, said in a statement.
Facebook's new messaging app is all about teenagers.
On its acquisition, tbh said, "We were compelled by the ways they could help us realize tbh's vision and bring it to more people". The app is designed for the teenagers of 13 and above.
The development of TBH has shown a similarity to Facebook's early growth - where it was only available in a handful of colleges for a short time, the makers of tbh only made the app available to users in certain states.
Perhaps most clearly, TBH is yet another channel where Facebook can command the time and attention of young people. Its prominence across different schools grew through the word of mouth. Snap, the parent company of Snapchat, is today worth $19bn.