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POPULAR dating apps like Grindr and OkCupid share personal data about users, including their location and sexuality, with about 100 other businesses, a Norwegian consumer group said on Tuesday, as it filed a complaint about breach-of-privacy rules.

The Norwegian Consumer Council found that 10 widely used Android apps that gather sensitive data about health, drug use and sexual preferences passed some of it on to advertising and marketing firms without clearly informing users.

"These practices are out of control and in breach of European data protection legislation," said Finn Myrstad, director of digital policy for the Norwegian Consumer Council.

"It is impossible for users to control this because the terms and conditions are really long and impossible to understand," he told the Thomson Reuters Foundation.

Tech companies have come under increased scrutiny over data privacy, fuelled by 2018's Cambridge Analytica scandal, in which data from tens of millions of Facebook profiles was harvested without their users' consent.

The European Union's General Data Protection Regulation (GDPR), implemented in 2018, heavily restricts companies' ability to process and share personal information without users' consent.

It imposes big fines for firms that break the rules.

The Norwegian Consumer Council filed a complaint on Tuesday against the US-based gay dating app Grindr and companies receiving data from it with Norway's data authority, which said it was looking into whether the app had broken GDPR rules.

Grindr said it rejected some of the report's conclusions, and added that its privacy policy was shared with all users, who had individual control over the information they chose to provide in their profiles.

"As the data-protection landscape continues to change, our commitment to user privacy remains steadfast," the company said in a statement.

The council's study found that the app, which is used by millions globally, shares data with a large number of third parties involved in advertising and profiling, many of which reserve the right to pass it on to others.

Norway's data protection commissioner Bjorn Erik Thon said in a statement: "Sharing location data for gay people can be risky in certain extreme circumstances.

"There are still some who do not want to be open about their orientation, and there are many countries in the world where being gay carries great risks," he added.

The study also found that OkCupid shares information from users' personal profiles related to sexuality, drug use and political views with an analytics company, and that the dating app Tinder shares location and age with marketing firms.

The Match Group, which owns OkCupid and Tinder, said in a statement that it used third-party providers to assist its services, but only shared information deemed necessary to operate its platforms, in line with the applicable laws.

"Privacy is at the core of our business," the company said. REUTERS