In their business plan Google (now Alphabet) favors a "greater good" for society rather than purely revenue optimization, whereas Facebook centers on the revenue and does not shy away morally doubtful decisions (like selling user data without regard for their anonymity, which Google avoids by restricting sensitive access to closed-loop algorithms).
And that makes sense in that Google historically (and still now) favors attracting talents and great minds (who lean leftwards) to work in its teams, to build the best technology, whereas Facebook tries to focus on its market, and how to please users (quite 50/50 politically) as well as business partners (maybe rather revenue-focused guys than socially responsible guys).
Both approaches make sense, but I do prefer the Google approach.