The web’s biggest merchant, Amazon, is fed up with phony product reviews and it's taking its complaints to court.

The retail giant filed a lawsuit against four companies -,, and - that allegedly sell fake four and five-star reviews that appear alongside products on the Amazon site.

"While small in number, these reviews threaten to undermine the trust that customers, and the vast majority of sellers and manufacturers, place in Amazon, thereby tarnishing Amazon's brand," the company's complaint said.

Scott Gamm, founder of Help Save My Dollars, appeared on "America's News Headquarters" to share some ways to look out for these fake reviews.

First, Gamm said, be wary of first-time or one-time reviewers. He recommended Googling the reviewers or establishing some sort of knowledge base on who they are.

Other tips are to check reviews on multiple sites, watch out for similar wording in reviews and discount extreme opinions.

Gamm said this highlights that we, as consumers, can't rely on even a massive company like Amazon to look out for our best interests.

"That's why we need to do the legwork ahead of time, to make sure we're getting the best bang for our buck."

Watch more from "America's News Headquarters" above.

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