Wall Street Journal: Verizon’s new mobile content service go90 is only just starting to lure users after kicking off a beta test a few weeks ago. But the millennial-focused video service already has a major advertiser commitment. Publicis, the world’s third-largest advertising group, has signed on for a yearlong ad partnership with go90 starting next month. The deal, which includes three months as the exclusive advertiser on the service, is said to be worth close to $50 million and involves more than 10 Publicis clients.