https://www.cnbc.com/2018/10/30/mark-zuckerberg-calls-apple-biggest-facebook-competitor-in-messaging.html

As Facebook eyes its messaging apps Messenger and WhatsApp to drive future growth, CEO Mark Zuckerberg is focused on a company that isn't even in the social media space: Apple.

"Our biggest competitor by far is iMessage," CEO Mark Zuckerberg said on an earnings call on Tuesday with investors, referring to the messaging service built into the iPhone and other Apple products.