Ads for Facebook Messenger are in the testing stage
During a press event at Advertising Week, Sheryl Sandberg, COO at Facebook, said advertising on Facebook Messenger is in the "very early experimentation stage" and could happen further down the line. Also when asked about M, the mobile personal assistant currently being tested for Messenger, Sandberg said that it i﻿s in a "really early test", only within the San Francisco Bay area. There are no plans to roll the product out.  

Will advertising come to Facebook Messenger ? Possibly somewhere down the line, but chief operating officer Sheryl Sandberg said it was still in the “very early experimentation stage.”

Sandberg made those comments during a press event at Advertising Week in New York Tuesday, where she also touched upon the shift to mobile, saying:

The shift to mobile is not coming. The shift to mobile has happened. It is still happening for marketers.

She also addressed video, saying: