Facebook has many more tentacles into the broader internet than just their app or website. I've paid 0 attention cycles to Twitter, so I am totally unware of them offering these other devices that give them the same insight that Facebook hoovers up. Do they offer SDKs to app devs at the same level as FB? Do they have nearly unavoidable tracking abilities across the internet? If they do, the internet seems to be much less vocal about them than the FB offerings.