https://www.wired.com/story/facebook-puts-stamp-name-instagram-whatsapp/

Facebook bought Instagram in 2012 and WhatsApp in 2014. But even today, many users of those apps don’t realize they are part of Mark Zuckerberg's empire. Facebook went to great lengths to allow them to operate as independent brands. There are many "I hate Mark Zuckerberg and Facebook. I'm going to Instagram" posts on social media.

The companies had their own CEOs, their own apps and websites, their own office buildings and email addresses. Facebook even allowed WhatsApp employees to have nicer desks and fancier bathrooms.