Google, Facebook and Twitter are of course massively powerful arbiters of what we see on the web, but the details of their rules and enforcement is undercovered. I’ve tried to fix that, in large part by relying on data collected by the Facebook Political Ad Collector aka Ad Observer projects (which I’ve had a large part in running.)

  • Facebook’s ads disclosures were illegible to blind users, casualties of Facebook’s fight against ad blockers. (Quartz)
  • Google had a secret guess about your personal politics. (Quartz)

Google and Facebook’s systems frequently “miss” ads that are banned or restricted – despite seemingly obvious signs.

And, sometimes the platforms’ broad ban thwart the good guys: