While mobile video was one of the most buzzed-about topics at this year’s Mobile World Congress. Facebook CEO Mark Zuckerberg proclaimed that video will be the breakout star of 2016: "Video in 2016 will probably be as big a shift in the way people share and consume as mobile was in 2012... We’re at this turning point." Reporting from Mobile World Congress, Todd Wasserman said other topics at the show included the prospect of high-speed wireless data via 5G; virtual reality; screen-less mobile; and ad blocking. Yahoo’s VP of EMEA Nick Hugh warned carriers to be "cautious" about adopting ad-blocking technology. "The digital system is a virtuous circle and while some operators may want to reduce costs by blocking ads, ultimately advertising helps drive uptake of all products, mobile services included, so we would urge caution," Hugh told Mobile World Daily, the paper publication circulated at the show. Some observers say that with 5G coming, people who use ad blockers may not have much of an argument that ads are slowing transmission speeds down.