Don't worry. Facebook's going to solve the problem by verifying advertisers with postcards.

https://www.npr.org/sections/thetwo-way/2018/02/20/587070994...

Except they only apply to ads with candidates mentioned in the copy, so it wouldn't stop Russians from promoting anti-immigrant sentiment, texas secessionism, or co-opting black lives matter protests. And it doesn't stop a Russian national from buying ads if they maintain a residence in the US. And it wouldn't stop the sort of meddling outside of advertising (fake accounts, fake pages, fake news articles).

So Facebook's working very hard to look like they're solving the problem. Guess we're in safe hands.