Google and Twitter’s battle over Google’s display of Google+ over Twitter results continues to drag out.

And now the FTC is involved.

The commission is reportedly evaluating the feature as part of its ongoing anti-trust investigation, and now a complaint by EPIC, the Electronic Privacy Information Center, has prompted a separate investigation.

As a matter of policy, the enforcement arm of the FTC is looking into whether Google’s policy for ranking Google+ in search results violates a settlement the FTC and Google struck last year about Google Buzz.

EPIC weighs in on the question of whether Google is unfairly promoting Google+ — an issue that Twitter has been up in arms about all week . EPIC writes: “Google’s changes implicate concerns over whether the company prioritizes its own content when returning search results.”

But EPIC is a privacy organization, and it raises questions about the implementation of the FTC’s consent order on privacy issues. EPIC takes issue with the fact that Google’s new ‘personalized’ search results include personal information, including photos, Google+ posts, and contact information. ( Click here to read the full letter).

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