Employment website Glassdoor claims more than 60 million unique visitors per month — but job seekers exploring company reviews are being fed a diet of deception, according to a new report.

Firms are pushing employees to post positive reviews on the site, warping the results in favor of the companies gaming the system, the Wall Street Journal reported Tuesday.

“Glassdoor has become an important arbiter of employee sentiment in today’s highly competitive job market,” the paper reported. “It can be manipulated by employers trying to sway opinion in their favor.”

The Journal said it analyzed millions of anonymous Glassdoor reviews, and found more than 400 companies had unusually large single-month jumps in numbers of reviews.

“During the vast majority of these surges, the ratings were disproportionately positive compared with the surrounding months,” according to the paper.

Glassdoor, to be sure, is not the only online player with a reported review problem. On Amazon’s e-commerce site, some popular categories of goods, including bluetooth headphones and speakers, appear to violate Amazon’s ban on paid reviews, with many fraudulent reviews originating on Facebook, the Washington Post reported in April 2018. Amazon told the paper — owned by Amazon CEO Jeff Bezos — that abusers of its platform make up a “tiny fraction” of activity on the website. Yelp and TripAdvisor also host fake reviews, the Journal noted, as do Facebook and Google, according to Forbes.

On Glassdoor, companies in some cases encouraged loyal workers to post reviews amid a publicity campaign, the Journal reported.

“SpaceX and SAP, for example, galvanized employees to leave reviews to make Glassdoor’s annual ranking of the ‘Best Places to Work,’” according to the paper.

“Other companies, including Guaranteed Rate, have pressured employees to write positive reviews in order to raise poor ratings, according to interviews with current and former employees.”

A SpaceX recruiter in the summer of 2017 sent emails encouraging employees to post reviews so the rocket firm of Elon Musk could make Glassdoor’s best-workplaces list, and workers were offered free SpaceX mugs for doing reviews, the Journal reported, citing an anonymous source. The previous October, “SpaceX employees flooded Glassdoor with 180 five-star reviews,” after SpaceX had “earned less than a dozen five-star reviews” in earlier months of 2016, according to the paper.

The SpaceX recruiter had highlighted on her LinkedIn page Glassdoor-review campaigns, saying they had raised the firm’s overall rating to 4.4 stars from 3.8 and made the best-employers list two years running, the Journal reported.

“She removed the reference to Glassdoor on her LinkedIn page in mid-December after being contacted by the Journal,” according to the paper.

SpaceX HR chief Brian Bjelde told the Journal that the firm would continue to “encourage employees to share honest, candid and accurate feedback about working at SpaceX,” the paper reported.

Other companies with large spikes in review numbers included business-messaging firm Slack, networking site LinkedIn, health insurance firm Anthem, plus Clorox, and Brown-Forman, which makes Jack Daniel’s whisky.

“Spokespeople for Slack, LinkedIn and Anthem said their companies have encouraged employees to give feedback,” the Journal reported.

“A Brown-Forman spokeswoman said it doesn’t have a formal strategy to solicit reviews. Clorox didn’t respond to a request for comment.”

A spokesman for mortgage broker Guaranteed Rate told the paper “his management team felt Glassdoor ratings didn’t accurately reflect the company’s work environment and so it asked employees to post reviews.”

Consultancy Bain & Co., recently named Glassdoor’s best workplace for 2019, has notched surges in reviews — disproportionally five star — in the months before the contest deadline since 2015, according to the Journal.

“Bain said employees are encouraged to participate in the Glassdoor ranking,” the paper reported.

Software giant SAP showed the Journal an Aug. 22 email from its “employer brand” team asking workers to post reviews on Glassdoor and mentioning the annual best-workplace award, the paper reported.

“It is our ambition to position SAP as one of the best employers in the U.S. — and you play an important role in making this happen,” the email said, according to the Journal.

Glassdoor told the Journal that review numbers can jump for a number of reasons, including hiring surges, company events or internal encouragement. The company rejects 5 percent to 10 percent of reviews for violating its guidelines, which bar reviews from fake accounts, a Glassdoor spokeswoman told the Journal, adding that suspected “ballot box stuffing” could lead the company to nix reviews.