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.
WhatsApp is not its own company, it belongs to Facebook/Meta.
Also, on that topic, you could do the same thing you did with X/Twitter to Meta/Facebook.
*edit: Oh, and of course Alphabet/Google. Curious how many big tech companies seem keen on obfuscating their own name these days…
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.
But this is about companies, not products or brand names.