The U.S. Federal Trade Commission is expanding its antitrust probe of Google to include the inspection of social network service Google+, according to Bloomberg.

The publication sourced two people “familiar with the situation,” and cited “competition issues raised by Google+” as the primary aspect of the FTC’s investigation into whether the globally popular search engine gives preference to its own services. The FTC is also inquiring whether such practices violate antitrust laws, according to Bloomberg, who could not identify its sources due to the investigation’s nonpublic status.

The Mountain View, Calif.-based company rolled out “Search, Plus Your World” to its search engine Jan. 10 and dubbed the revision a “personal results” feature that displays Google+ photographs, news and comments when user’s conduct Web searches. The Electronic Privacy Information Center promptly called upon the FTC on Jan. 12 to investigate the recent search changes in a letter posted on its website…

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