Facebook's plan to integrate messaging across the three services could lead to additional scrutiny from lawmakers, which past year called Zuckerberg and other executives from Twitter and Google to testify before Congress. However, on the dark side, it would also mean that Facebook would be able to fetch more data from users and use targeted advertisements in its walled garden of the services. It is also reported that Mark Zuckerberg has directed all the applications to implement end-to-end encryption which significantly boosts the user privacy.
End-to-end encryption means that your message is garbled into gibberish during transit, and can only be read in its true form by the sender and recipient.
While there are many questions around how this would work and the impact it may have on users, the possibility of consolidating the messaging structure underneath WhatsApp, Instagram and Facebook Messenger could have major implications for brands and advertisers.
Say, a user only has a Whatsapp account, and hates Facebook and Instagram. The firm expects to complete the job by the end of the year or early 2020.
Until now, WhatsApp, Instagram and Messenger have been run as separate and competing products.
Such synergy could connect billions of users and, perhaps, impact competitors such as Apple and Google. All three services will continue operating as stand-alone apps, but they will operate from the same underlying messaging infrastructure.
The move will require all the apps to use end-to-end encryption, which is a security measure used in WhatsApp to ensure that people outside of conversations can not read private messages.
Instagram founders Kevin Systrom and Mike Kriege left the company in September 2018 amid reports the pair had become frustrated by Mr Zuckerberg's increased day-to-day involvement and decision to make Instagram more central in Facebook's future trajectory, six months after WhatsApp co-founder Jan Koum's departure.
But bigger still: it makes Facebook's suite of apps a much tighter, interwoven collection of services. Alternatively, an Instagram user could send a direct message from the app to a WhatsApp user. Such a change could allow users to communicate between apps - for example, a Facebook user could message a friend who uses WhatsApp. With Facebook and other social media sites, the services are free "and we work separately with the advertisers to show you relevant ads".