Facebook Groups is awash with easy-to-find pirated copies of Hollywood movies.

Business Insider found numerous groups openly advertising illegal copies of the latest blockbuster films.

Facebook's automated software, which is supposed to detect copyright infringement, failed to detect the bootleg videos, and its human moderators are doing nothing.

The social network says it's not its responsibility to take down the videos or Groups unless the rights holders get in touch, even if the content is clearly stolen.

Facebook Groups has a piracy problem — and the company says there's nothing it can do about it.

The social network is awash with groups devoted to freely sharing pirated Hollywood movies with hundreds of thousands of users, Business Insider has found.

With names like "Full HD English Movie" and "Free full movies 2018," these Facebook groups make no attempt to hide their purpose or to conceal catalogs brimming with the latest blockbusters like "Ant Man and the Wasp" and "A Quiet Place." Business Insider found them by simply searching for "free movies" on Facebook.

These groups, some of which are years old, exist despite Facebook's army of human content moderators and automated software meant to detect copyright-infringing content, raising questions about the effectiveness of Facebook's content-policing systems.

Reached for comment, a Facebook representative said it wasn't the company's responsibility to take down such content unless asked to by the content's rights holders, even if the videos seem clearly stolen, because otherwise Facebook can't be sure it is being illegally shared.

The strange result is a sort of safe zone for pirated videos on the social network of 2 billion members, which has long insisted that it is a neutral distribution platform and not a media company. That position may be increasingly difficult to argue, however, as Facebook moves ahead with efforts to develop its own video offerings.

And just as Facebook was pressured to clamp down on misleading and false news articles shared on its network, the pirated video groups could provide another test of the limits of Facebook's power.

A selection of Hollywood movies being uploaded to Facebook including "50 Shades Freed," "A Quiet Place," and "Ant Man and the Wasp." (Users' names have been redacted.) BI

The piracy groups often have hundreds of thousands of members

Sometimes the movies are hosted directly on Facebook's servers, while other times the groups link to illicit versions on other websites.

"Full HD English Movie," which has more than 134,000 members, hosted pirated copies on Facebook of movies including "The Greatest Showman," "Transformers: The Last Knight," and "A Quiet Place." It has been around since at least 2016.

"Free full movies 2018," also from 2016 or earlier, has 171,000 members, and its films included "50 Shades Freed" and "Every Day." It also linked to a version of "Transformers: The Last Knight" hosted elsewhere on Facebook that had more than 360,000 views and a copy of a "Pirates of the Caribbean" film with 51,000.

A small sample of the groups that appear when you search Facebook for "free movies." Many have tens or hundreds of thousands of users. BI

Some have dubious legal disclaimers trying to absolve the group admins of any responsibilities, like the 7,000-strong "Latest Movie Download," which warns would-be members: "All of the free movies found on this group are hosted on third-party servers ... Any legal issues regarding the latest movie download group should be taken up with the actual file hosts themselves, as we're not affiliated with them."

There are numerous other groups just like this, including "(W.O.S) It's Free why you Complaining 'Main Movie Group'" (76,000 members), "Watch Free Full Movies HD" (41,000 members), and "Share link watch full HD movie online 2018" (7,000 members).

Facebook has a history of moderation headaches

Facebook has been repeatedly criticized over the way it moderates the content that appears on its network, from its censorship of Pulitzer Prize-winning photography to the spread of intentionally false news and misinformation.

On multiple occasions, it has taken public pressure from media reports before Facebook (and other social networks) take action over objectionable content. After journalists called out the spread of hoaxes on social media following the shooting at a high school in Parkland, Florida, BuzzFeed's Charlie Warzel asked: "All of this raises a mind-bendingly simple question that YouTube, Google, Twitter, and Facebook have not yet answered: How is it that the average untrained human can do something that multibillion-dollar technology companies that pride themselves on innovation cannot?"

Users in some of the groups share links to off-site versions of pirated movies. (Users' names and links have been redacted.) BI

The illicit spread of copyrighted video has been a particular headache for Facebook. Back when the social network began emphasizing video, content creators widely complained about "freebooting" — people stealing viral videos and uploading them to their pages for publicity.

The company has since introduced software intended to detect unauthorized video uploads, and in July 2017 it acquired Source3, a company that builds software to sniff out unauthorized video uploads. This software, however, seems to have failed to detect the plethora of piracy floating around in Facebook Groups.

Facebook also doesn't allow users to report copyright infringement unless they own the rights to the material being shared illicitly — meaning there's no way for ordinary users to alert the company to groups or pages that share pirated material.

The company argues it's not its job to police this stuff

Facebook's response to this problem is that because it can't know for sure that these videos are pirated, it will leave them up — no matter how implausible the alternative.

It is hard to believe that Marvel would upload or condone the uploading to Facebook of blurry, camera-recorded copies of "Ant Man and the Wasp," a film still in theaters. But because the origin of such videos is technically unclear, Facebook is washing its hands of the matter.

"Facebook is not in a position to determine what content a rights holder believes infringes their rights," a Facebook representative said. "If a rights holder identifies content on Facebook they believe violates their IP rights, they can report it to us at any time using our online reporting channels."

The person added: "We have a global team that processes these reports across time zones, and we will disable accounts that repeatedly violate IP rights. In addition to manual reporting processes, we have devoted significant resources to copyright tools such as Rights Manager that help rights holders manage their IP on the platform."

Business Insider provided Facebook with a list of groups clearly dedicated to sharing pirated movies. It took no action against them.

A group on Facebook with 40,000 members advertising free Hollywood movies. Facebook's "Suggested Groups" feature also suggests other piracy-related groups to join. (Links and personal information redacted.) BI

Facebook doesn't have a legal responsibility to act — but that doesn't satisfy rights holders

Under the Digital Millennium Copyright Act, Facebook isn't liable for copyrighted material being shared on its platform, so long as it takes swift action when contacted by the rights holders.

But the ease of access to pirated movies on Facebook raises the question of whether Facebook has a civic responsibility to do more, and rights holders and advocacy groups have criticized the company over its inaction.

"All platforms — including Facebook — have a responsibility to take proactive steps to ensure that they are not facilitating the theft of content, which harms creatives and consumers alike," Ruth Vitale, the CEO of the nonprofit creative industry group CreativeFuture, told Business Insider in a statement.

"All rights holders are prepared to work collaboratively with FB to help them build and improve their tools for protecting copyright," Vitale said. "And remember Mark Zuckerberg's statement at the House and Senate hearings (paraphrased here): 'Facebook needs to be responsible for the content on its platform.' We ask that he honor that statement."