You really think every social media platform around the world will set up roadblocks to their primary source of income? You're still just focusing on ads, there's a lot more to it. What about the media companies looking to push their content to grow readership, that would all have to be assessed and censored too, with the massive overheads and implications on freedom of speech.Thats my point. Russian ads placed on foreign sites (like Bord Failte) attempting to sway US public opinion is next to useless.
The primary location to place ads would be on platforms that can use sophisticated targeting, like FB and Google.
Those companies, platforms, should be able to filter out political ads, where the source of those ads is not clearly identifiable. By that I mean, the purchaser of political ads on FB to be used to target US public must be identifiable to FB otherwise they refuse the ad.