Facebook the product is still called Facebook, Google the product is still called Google. It's only the parent companies that changed their names, their products kept the same branding.
Twitter the product has been, or is being, rebranded as X along with the company.
Facebook and WhatsApp were separate apps until Facebook bought WhatsApp. That's why there's so much difference in the design language, functionality, etc.
You can see the difference between the Apple and WhatsApp version.
And I have Whatsapp installed on Android and it looks the same as the WhatsApp Emoji in the picture.
So it doesn't use the System Style, WhatsApp has its own IOS looking emojis.
Oh, yeah, I know how emojis work using unicode, I just didn't bother to attach an image of the Samsung 😬 emoji for laziness reasons (I myself don't have a Samsung Smartphone either.)
I'm sorry, I should have done that, now I have made myself look like a fool :')
Near miss. GIMP on Ubuntu, and the emojis originate from here. Just for fun I tried to match the gradient of the image featured in the article, instead of pasting the emojis one by one.