Facebook, you can read on the official statement, "started as a single app. Now, 15 years later, we offer a suite of products” (Facebook app, Messenger, Instagram, WhatsApp, Oculus, Workplace, Portal, Calibra, etc.). “Today, we're updating our company branding (by) introducing a new company logo and further distinguishing the Facebook company from the Facebook app, which will keep its own branding." Logos and assets can be downloaded here.