Mailing free home HIV tests to high-risk men offers a potentially better strategy for detecting infections than usual care. That´s according to a US government study that resulted in many more infections found – including among friends with whom recipients shared extra kits. The yearlong experiment recruited 2,600 men from online social network and music sites. Those who signed up were sent four free test kits but could order more. Many did and shared them. Overall, 25 infections were detected in the self-testing group, versus 11 in men who just got links to local services.