A U.S. judge ordered Yahoo Inc to face a nationwide class-action lawsuit accusing it of illegally intercepting the content of emails sent to Yahoo Mail subscribers from non-Yahoo Mail accounts, and using the information to boost advertising revenue.
For anyone wondering "What about Google?", apparently since too many people use Google services it's too hard to tell who's agreed or not to the Google T.O.S.
She distinguished the case from her March 2014 refusal to certify a similar class action against Google Inc on behalf of Gmail and non-Gmail subscribers because it was hard to determine which users consented to Google's activity.