A hack and data breach at location data broker Gravy Analytics is threatening the privacy of millions of people around the world whose smartphone apps unwittingly revealed their location data collected by the data giant.

Data broker Gravy Analytics Inc. faces a proposed class action accusing the company of failing to adequately secure sensitive location data obtained by a hacker in a data breach uncovered in January.

The recent Gravy Analytics breach included location data from millions of users across hundreds of popular apps. Here's how to protect your information.