Facebook deletes, then restores Warren's ads

SENATOR Elizabeth Warren, the Massachusetts Democrat vying for the presidency, didn't have to search far for ammunition in her salvo against Facebook and other technology giants.

Her own campaign, she said, had become a case study in the need to curtail Facebook's power, after the company temporarily removed her ads flaying the social networking service as anti-competitive.

She used the flap to warn that it was dangerous for cyberspace to be "dominated by a single censor".