"I don't personally think ads are the right way to monetize messaging," Facebook (NASDAQ: FB) CEO Mark Zuckerberg famously said in the wake of the 2014 acquisition of WhatsApp. While Zuck was referring to WhatsApp, the statement did seemingly have implications for Facebook's homegrown messaging service, Messenger. In the years since, Facebook has changed its tune, starting to test out ads in Messenger in 2017.After reversing course on its monetization strategy, the social network is now doubling down on Messenger ads.Chatting with businesses will be Messenger's other monetization strategy.