Social-media businesses are built on getting people to broadcast their feelings as much as possible. That strategy can cut both ways.
Snap Inc. is battling a backlash from users over a new version of its Snapchat social-media app, which was launched in February and is aimed at broadening its business beyond its core teen and young adult audience. More than 1.2 million Snapchat users have signed a petition to roll back the revamp. In late February, the company’s shares fell about 6% in reaction to this tweet by reality-television...