To me, Facebook is the service I use as login credentials on McDonalds app and other companies, separate from my offline and online identities. Also it is a social network I don't engage with. Owned by Meta.
WhatsApp is a chat program I use almost every day. Owned by Meta.
Oculus was a brand of VR goggles, but now the brand name is Meta. Owned by Meta.
To me, Facebook is something I deleted around 2013. Never saw any real reason to create another account, honestly saw so many reasons not to.
WhatsApp is something I only use in a strict sandbox to communicate with certain Chinese sellers, as well as one friend who sometimes can't use Discord/Telegram.
Oculus used to be usable offline, wired and without an account, but now requires to be logged into an account ever since Facebook acquired it (as Meta). So my first headset was an HP Reverb G2.
Also, since 'VR goggles' are starting to genuinely be a thing (see Bigscreen Beyond, or probably more the Ray-Ban stuff and the other stuff starting to pop up in that category), the more general term that the Oculus Rift counts as would be HMD (head-mounted display).
WhatsApp is a chat program I use almost every day. Owned by Meta.
Oculus was a brand of VR goggles, but now the brand name is Meta. Owned by Meta.