$FB did have some cause for pulling the Warren ad: "The "f" may seem innocuous, but the company's advertising policies on "brand usage" specifically ban employing the letter as a symbol meant to reference Facebook. "Back in the bad old days, advertisers would often invoke Facebook as a feigned endorsement," https://twitter.com/antoniogm/status/1105247572564762624!function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0],p=/^http:/.test(d.location)?'http':'https';if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src=p+"://platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); Antonio Garcia Martinez, a former Facebook ad targeting manager, on why the policy was put in place."