Facebook should be treated the same way and spit up vertically then, not horizontally. Datacenter and infrastructure and all their low level services should be split from client apps, NOT messenger split from whatsapp.
Not sure why this would carry over to Facebook. Amazon sells metered compute or hosting infrastructure used by half the internet, Facebook doesn't sell infrastructure to anyone. Going by their actual levers of market power, you absolutely would split WhatsApp and Instagram off.
I still dont think you can justify any of those as monopolies yet.
Snapchat, twitter, pinterest, reddit, youtube, hangouts/gmessenger, linkedin, skype/groupme, imessage, discord, kik, line, telegram, signal. Especially justifying Instagram, because facebook really made it what it is. WhatsApp MAYBE, but in reality what facebook is doing is owning both the US and INTL messengers, I dont think they overlap in a way that justifies splitting it up, because FB's US marketshare doesnt drastically increase from WA. Is it the justice departments job from to allow the most popular domestic product from merging with the most popular international product? Uber being able to swallow up or own shares in all these regional services should be questioned then. FB/WA still have viable competition from imessage, snapchat, and skype.
