Why not to use FB in one classic line: you are the product being sold, everything else is just an illusion. Case in point: in FB. ads you can even target specific individuals.
The only problem is that like every social illusion it creates a social contract which makes it hard to get out of it - mostly because it will feel like being isolated from the "world" and in losing that perfectly crafted new "self/identity" will shatter the ego (we all know the ego doesn't enjoy being messed with).
Even if one is using it "just" for the messenger part, one is still part of all of this.
I'm not sure why would anyone use FB. to get new opportunities, FB. et al should not be taken seriously since most create their own persona on it akin to an MMORPG where one can literally choose to act like an Apache helicopter.
Moreover FB. is pure evil at its core: it's a global scale psychological experiment that future generations will refer to as: "those decades where everyone diluted their identity online, forgot about their "real" selves and thus slowly became clinically insane".
Some of the other arguments in the article are so broad that one can apply them to the Internet as a whole e.g. "distraction free work: just unplug your cable or disconnect your wi-fi"