EU Begins Questioning Facebook Rivals Over WhatsApp Deal

European Union antitrust officials have started questioning rival firms about Facebook's proposed $19 billion acquisition of messaging service WhatsApp, ahead of a formal review that could be a test case for how to apply EU competition law to the new world of social media.

Officials at the European Commission, the EU's central competition authority, have in recent weeks sent detailed questionnaires to several technology and online-messaging companies, asking about the merger's effect on competition in their markets, according to people familiar with the matter.

The questionnaires also drill down into a relatively new area for merger reviews: how the companies control and use personal data when they offer services, some of the people said.

The commission's questioning of rivals comes before the EU opens a formal merger review that will provide one of the first in-depth looks at the app economy and social media through the lens of competition law, antitrust lawyers and technology executives say.