Facebook's latest update aims to reduce links to spammy websites filled with ads
Upon the arrival of the update, Facebook users should see fewer posts and ads in News Feed that link to these so-called “low-quality web page experiences.” The update is meant to help reduce the level of monetization of these spammy websites.
Basically, Facebook is using artificial intelligence to check whether or not new websites shared on Facebook offer low-quality experiences. Those that do will show up lower in the people's feeds and may not be eligible to be an ad.
According to Facebook, the new changes will be rolled out in waves over the coming months, so you might not see any improvements yet. Naturally, publishers that don't have low-quality landing page experience referenced will see an increase in traffic, while others who do will be hit with a decline in traffic.
source: Facebook
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Things that are NOT allowed: