The Competition and Markets Authority (CMA) is opening an investigation into Facebook over its collection and use of data.
The probe will look at whether the social media giant might be abusing a dominant position in the market through its use of advertising and single sign-on data.
The investigation comes under Chapter II of the Competition Act 1998 into suspected breaches of competition law.
The European Commission is also looking at whether Facebook has violated EU rules by collecting data from advertisers to compete in providing classified ads.
The commission said it had launched a formal antitrust investigatoin of the BigTech company to “assess whether Facebook violated EU competition rules by using advertising data gathered in particular from advertisers in order to compete with them in markets where Facebook is active such as classified ads.”
It added: "The formal investigation will also assess whether Facebook ties its online classified ads service "Facebook Marketplace" to its social network, in breach of EU competition rules."
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