google's, or more broadly, alphabet's, only competitive advantage is a thin lead on what might be called data intelligence (or surveillance, for the more cynical). they collect data across all internet ingresses/egresses, on not just those who opt-in, but even those who actively avoid google (through android, gmail, google apps, analytics, dns, internet access, etc.). and that data is super-valuable--alphabet had $30B in profits on $137B in revenue (an extraordinary margin).
to be clear, i'm not attempting to judge or disparage individual engineers at google. i'm sure most are mighty fine folks.
but for the foreseeable future, google really has no choice in the matter, not until it finds a different massive market from which to derive revenues. it's the nature of the business. and in the meantime, it's also under assault from intelligence, paramilitary, corporate, and governmental organizations from across the globe.
at least for americans, privacy and liberty are fundamental and inalienable rights. even though the consitution explicitly forbids only governmental interference in those rights, they apply more broadly to any entity, and particularly global corporations, attempting to exert power on individuals. and while inalienable, citizens still have a duty to be vigilant against such infringements.
That seems likely to be a grand understatement. FB has the opportunity to collect a great deal of data about their users beyond what they explicitly post -- for example, data about when and how they use Facebook mobile apps, how they interact with the Facebook web site, and what external web sites they visit which contain Facebook Like widgets.
Waaay more valuable than FB scraping my phonebook and photos
As well as all the data they can get, whether or not you even have a Facebook account. Real-world credit/debit card usage data, for instance.