There is a reason they call it Fakebook:
Facebook has begun letting partners fact check photos and videos beyond news articles, and proactively review stories before Facebook asks them. Facebook is also now preemptively blocking the creation of millions of fake accounts per day.
Source: Facebook starts fact checking photos/videos, blocks millions of fake accounts per day | TechCrunch
And like I’ve long said, most of this is about online, social media-based, for profit business publishing, not election meddling:
Facebook first piloted this tool in the Alabama special election where the proactive system identified and shut down a ring of Macedonian spammers meddling with the election to earn money.