In this Thursday, March 2, 2017, file photo, a banner for Snap Inc. hangs from the front of the New York Stock Exchange, in New York. (AP Photo/Mark Lennihan, File)

The Chinese internet company Tencent is buying a 10 percent stake in Snap, further expanding its ownership in large U.S. technology companies. Tencent runs the WeChat messaging app, as well as o...