Sir Martin Sorrell reacts to latest Facebook metrics revelations: 'The player & referee cannot be the same'

Following Facebook’s admission of more miscalculated metrics that saw the social giant undercount and overcount key measurements on the platform, like monthly reach of posts and time spent on publishers’ Instant Articles, chief executive of WPP has commented on the revelations.
“Clearly it's an example where the player and referee cannot be the same person or where you cannot mark your own homework,” he said.
“As you know, Comscore in which we have a 20% investment,