Russia-linked political adverts

Facebook to share Russia-linked political adverts with investigators

He also pledged to make political advertising more transparent on his network in future.

"We will work with others to create a new standard for transparency for online political ads," he said in a live address on his Facebook profile.

He said political advertising will now carry disclaimers about which campaign or organisation paid for it.

He added that the company was continuing to investigate instances of foreign actors abusing its advertising platform, including Russia and other "former Soviet states".