EdgeRank is the name commonly given to the algorithm that Facebook uses to determine what articles should be displayed in a user's News Feed.
As of 2011, Facebook has stopped using the EdgeRank system and uses a machine learning algorithm that, as of 2013, takes more than 100,000 factors into account.
In 2010, a simplified version of the EdgeRank algorithm was presented as: where: Some of the methods that Facebook uses to adjust the parameters are proprietary and not available to the public.
or alter people's mood (if users are shown a disproportionate amount of positive or negative updates).
[4] As a result, for Facebook pages, the typical engagement rate is less than 1% (or less than 0.1% for the bigger ones),[5] and organic reach 10% or less for most non-profits.