Assignment:
Facebook issue: "Eglet Prince has filed a class action lawsuit against Facebook, seeking in excess of $5 million in damages. The suit was filed after Facebook, a leading advertising medium worldwide, admitted for the first time that it used faulty metrics to measure the duration that viewers watched paid advertisements distributed on the social media platform."
https://www.wsj.com/articles/facebook-overestimated-key-video-metric-for-two-years-1474586951
Descibe the legal significance in this case facing by Facebook.
About 1-2 paragraphs with related supporting evidences.
APA style.