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Grindr, the worlds largest gay dating app, is set to change its software this week to urge millions of users to get frequent HIV tests, in an an effort to shrink the global epidemic, the media reported. Grindr, which claims to have 3.3 million daily users from every country in the world, will send men who opt into the service a reminder every three to six months, and simultaneously point them to the nearest testing site, The New York Times reported.