Business Live: Facebook helps Congress over Russia ads - BBC News
Move sparked by adverts during US election; Zuckerberg promises greater transparency.
Facebook founder Mark Zuckerberg says his company will share 3,000 Russia-linked political adverts with US 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.