Elizabeth Warren targets Facebook's ad policy of exempting ads by politicians from third-party fact-checking by running a Facebook ad with a clear falsehood (Brian Fung/CNN)

Brian Fung / CNN:
Elizabeth Warren targets Facebook's ad policy of exempting ads by politicians from third-party fact-checking by running a Facebook ad with a clear falsehood  —  Zuckerberg says legal battles during a Warren presidency would ‘suck’  —  (CNN)A fresh series of Facebook ads this week …