A sign at Etsy's Brooklyn office in 2007 encapsulated the company's ambitious goal: Take down big-box retailers by selling handmade goods. Now Etsy, which in 2012 began allowing some mass-produced goods on its e-commerce site, is filing for an IPO, and trying to maintain its values as it expands. Amit Gupta/Flickr hide caption

itoggle caption Amit Gupta/Flickr

More than 600 Porto city buses and taxis have been fitted with routers to provide free Wi-Fi service. It's being touted as the biggest Wi-Fi-in-motion network in the world. Sérgio Rodrigues/Veniam hide caption

itoggle caption Sérgio Rodrigues/Veniam

The sun sets as a visitor uses his mobile phone Monday during the opening day of the 2015 Mobile World Congress in Barcelona. Wall Street Journal reporter Ryan Knutson — interviewed from the conference Monday via Skype by NPR's Robert Siegel — says that for some smartphone users, Wi-Fi may be able to replace most of the functionality of a cellphone carrier. Josep Lago/AFP/Getty Images hide caption

itoggle caption Josep Lago/AFP/Getty Images

A man takes a "selfie" while waiting in line to cast his vote in the Wisconsin gubernatorial race in November. Darren Hauck/Getty Images hide caption

itoggle caption Darren Hauck/Getty Images

At the start of a meeting to decide the issue of net neutrality, Federal Communications Commission Chairman Tom Wheeler (center) holds hands with FCC Commissioners Mignon Clyburn (left) and Jessica Rosenworcel at the FCC headquarters Thursday. Mark Wilson/Getty Images hide caption

itoggle caption Mark Wilson/Getty Images

T-Mobile CEO John Legere pitches a plan that allows unlimited music streaming without additional data charges. Some net neutrality proponents want the FCC to limit plans like these; the commission says it will review them on a case-by-case basis. Ted S. Warren/AP hide caption

itoggle caption Ted S. Warren/AP

With the technology to conduct more nuanced tests, some companies say they can provide more useful detail about how people think in dynamic situations. Marcus Butt/Getty Images/Ikon Images hide caption

itoggle caption Marcus Butt/Getty Images/Ikon Images