Currently, the only way to get the company to focus its efforts on truthful news and protection from abuse is through regulation, which happily it looks like the EU has started doing.
But the deeper issue is Facebook being a for-profit, closed-data-garden, global social media behemoth who strangles competition aggressively. As a result, there are few other social media sources to get the truth from, and there is no real competitive pressure on Facebook to make it care enough about protecting its users from abuse.