As reported in BuzzFeed News, the popular gay dating app Grindr was -- until publicly outed for this practice  -- providing its users’ HIV status (as shown in users' profiles) to two app optimization vendors. Grindr also provided the vendors with users' GPS data, phone ID, and email, making the identification of specific users possible.  All but the HIV status was reportedly provided in easily hackable plain text files.  

BuzzFeed News reports that users feel particularly betrayed by this news given Grindr's branding as a supporter of the queer community.

This story underscores not only the importance of transparency in companies' practices in how they treat their users' sensitive data, but also the very obvious point that companies must behave in ways that are consistent with their stated mission to retain their users' trust.