Facebook partially reveals its content recommendation algorithm

The new documentation available in the Facebook Help Center and Instagram Help Center outlines

outlines how Facebook and Instagram algorithms work to filter content, pages, groups, and events to recommend to the user.

Offers can be displayed as pages,that you might like, “Recommended for You” posts in your newsfeed, people you might know, or groups you should join. Instagram suggestions can be found on Instagram Explore, Accounts You May Like, and IGTV Discover.

The company states that the existing guidelinesFacebook's principles have been in place since 2016 as part of what it calls “delete, cut and inform”. This strategy focuses on removing content that violates Facebook's community standards, reducing the spread of problematic content that does not violate its standards, and providing people with more information so they can choose what to click, read or share, Facebook explains.

Facebook details in new documentationfive key categories that cannot be included in recommendations. Instagram's rules are similar. However, the documentation doesn't provide a deep understanding of how Facebook actually chooses what to recommend to a particular user. This is a key point in understanding recommendation technology, and one Facebook deliberately left out.

One obvious category of content that isn'tmay be recommended, includes content that interferes with Facebook's “ability to create a safe community”, such as self-harm, eating disorders, violence, etc., and sexually explicit and regulated content such as tobacco , as well as content that is used by non-recommended accounts or organizations.

Facebook also says it doesn't recommendsensitive or low-quality content, content that users often dislike, and content associated with low-quality posts. These additional categories include things like clickbaits, deceptive business models, payday loans, products with exaggerated health claims or offering "magic cures", content promoting beauty treatments, contests, giveaways.

Additionally, Facebook says it will not recommend fake or misleading content, such as vaccine disinformation and content that encourages the use of fake documents.

It says it will also “try” not to recommend accounts or organizations that have recently violated community standards.

Given Facebook's track record, it's worththink about how well Facebook can follow its own set of rules. It is also worth noting that there are many gray areas that these guidelines do not cover.

Conspiracy theory groups are just a couple of examples. 

For example, a quick search for "vaccines" now reveals a number of groups focused on alternative treatments and anti-vaxxer groups. 

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