In the wake of a recent controversy surrounding Google's decision to feature Google+ content in its search results, the company will face scrutiny of its social networking service from the U.S. Federal Trade Commission as part of an antitrust probe, a new report claims.

Two people familiar with the situation have alerted Bloomberg to the federal agency's plan to include Google+ in the investigation. At issue is the possibility that Google violated antitrust laws if it gave preference to its own services on its search engine, the sources said.