Walmart may be the most intriguing player in advertising

Could a Roku acquisition make sense? Could an advertiser actually crack the triopoly?

One of the things that really stood out this year at Cannes was the Amazon Port, which took over a little-noticed dock area and turned it into a pavilion featuring concerts, tai chi sessions and panels on data-driven creativity.

This form of ‘activation’ would be hard to envision just a few years ago, when Amazon ad sellers lurked in the shadows and the …