[knice]

It is not in Facebook's monetary interest to identify or remove fake or questionable news from our news feeds. By it's nature, fake news is emotional. It causes an emotional, gut-level reaction ("OMG, must like and share this!") that promotes virality. Virality === $$$ for Facebook. I imagine they have already experimented with news feed filters that reduce noise and I'm sure the result was reduced engagement. As long as Facebook profits from attention, we should expect them to be tepid at best about any change that reduces their share of our attention.