By Natasha Singer and

Popular dating services like Grindr, OkCupid and Tinder are spreading user information like dating choices and precise location to advertising and marketing companies in ways that may violate privacy laws, according to a new report that examined some of the world’s most downloaded Android apps.

Grindr, the world’s most popular gay dating app, transmitted user-tracking codes and the app’s name to more than a dozen companies, essentially tagging individuals with their sexual orientation, according to the report, which was released Tuesday by the Norwegian Consumer Council, a government-funded nonprofit organization in Oslo.

Grindr also sent a user’s location to multiple companies, which may then share that data with many other businesses, the report said. When The New York Times tested Grindr’s Android app, it shared precise latitude and longitude information with five companies.

The researchers also reported that the OkCupid app sent a user’s ethnicity and answers to personal profile questions — like “Have you used psychedelic drugs?" — to a firm that helps companies tailor marketing messages to users. The Times found that the OkCupid site had recently posted a list of more than 300 advertising and analytics “partners” with which it may share users’ information.