Knitting together Facebook’s apps is a stark reversal of Mr. Zuckerberg’s previous stance toward WhatsApp and Instagram, which were independent companies that Facebook acquired. At the time of the acquisitions, Mr. Zuckerberg promised WhatsApp and Instagram plenty of autonomy from their new parent company. (Facebook Messenger is a homegrown service spun off the main Facebook app in 2014.)
WhatsApp and Instagram have grown tremendously since then, prompting Mr. Zuckerberg to change his thinking, one of the people said. He now believes integrating the services more tightly will benefit Facebook’s entire “family of apps” in the long term by making them more useful, the person said. Mr. Zuckerberg floated the idea for months and began to promote it to employees more heavily toward the end of 2018, the people said.
.. The effort has caused strife within Facebook. Instagram’s founders, Kevin Systrom and Mike Krieger, left the company abruptly last fallafter Mr. Zuckerberg began weighing in more. WhatsApp’s founders, Jan Koum and Brian Acton, departed for similar reasons. More recently, dozens of WhatsApp employees clashed with Mr. Zuckerberg over the integration plan on internal message boards and during a contentious staff meeting in December, according to four people who attended or were briefed on the event.
The integration plan raises privacy questions because of how users’ data may be shared between services. WhatsApp currently requires only a phone number when new users sign up. By contrast, Facebook and Facebook Messenger ask users to provide their true identities. Matching Facebook and Instagram users to their WhatsApp handles could give pause to those who prefer to keep their use of each app separate.