And you just figured this out now? This is like saying "wow, who knew we would get so fat by feeding only on pizza, hamburgers and coke, aren't those companies evil".
Well, yes, companies are evil. They don't work for you; they either sell something to you, that is usually bad for you (why else would you want it), or take something from you, that they can then sell to somebody else.
> Should we all just leave Facebook? That may sound attractive but it is not a viable solution.
Of course it is. It's the only solution. If you think Facebook's management care about anything else except the number of active users, you're crazy. The only way to have them change their ways (maybe) is to make that number go down. It's also good for you, like drinking water instead of soda.