Targeting ads is not selling data. I'll grant you that targeting political ads is its own form of evil, but that's not what Cambridge Analytica was about. Facebook gave them the actual targeting data (i.e., the lists of actual users and their preferences), supposedly for academic research. And then CA used that data to micro target ads to specific users.
In any case, after 2016, Google stopped allowing targeted political ads (either x months before an election, or with some other caveats - but at least they did something). Facebook did not.
And that's beyond the whole issue that a typical Facebook 'news feed' is 80% paid content disguised to look like news items - often tagged with the name of a friend who supposedly 'recommended' it. I think the actual verbiage is something like [YOUR FRIEND'S NAME] likes [THIS ADVERTISER]. i.e., they didn't recommend the item you're seeing, but you're free to assume they did, and that's the whole point... This whole phony news feed thing is what was exploited to allow ads that, for example, said "hey, targeted fellow black guy in Detroit, this black lives matter group thinks we should all sit out the election as a protest".
This is nothing like the 'extensive use' the Obama campaign made of the social network in 2008 and 2012. It's fraud. Aided and abetted by Mr Zuckerberg, thank you very much.