Tripadvisor says that it rejected or removed more than two million reviews in 2020, using review analysis technology or manually.
In its 2021 Tripadvisor Review Transparency Report, the company says the two million represented about 9% of all submissions, with almost one million of those judged to be fraudulent.
The 9% is a marked increase from 2018's figure of almost 5% of rejected or removed reviews.
The report goes on to say that it prevented 67% of the near one million fraudelent reviews from making it on to the site.
Tripadvisor says it also removed more than 46,000 reviews which did not meet the platforms new COVID-19 posting guidelines such as misinformation or criticism of businesses taking precautions.
The company says it moderated an additional 357,000 reviews as a result of these guidelines.
In addition, the company says it penalized 34,605 properties for fraudulent activity.
The company goes on to provide more detail on its screening process with almost 92% of reviews posted onto the site in 2020 after an automatic screening, 3% were automatically rejected and about 5% were flagged to be looked by humans.
Tripadvisor says there are three main reasons for reviews to be rejected or removed and in 2020 48% were said to violate the platforms standards, 49% deemed fake or biased and the remainder put down as administrative/other meaning a business has closed or a reviewer has removed their submission.
The company says that it has established a Trust & Safety website as part of its commitment to trust and transparency.
The website includes information on the company's efforts around trust and training for hospitality employees as part of Tripadvisor Says No More programme to prevent sexual harassment and assault.