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Facebook has announced yet another measurement error,russian teen sex video the fourth time the company has come forward to admit a discrepancy in its calculations since September.

SEE ALSO: Facebook’s fake news fix comes way too late

This time the error involved undercounting traffic from publishers who used Instant Articles, the platform where media outlets post content directly to the social network. Facebook said a software update caused mobile traffic from iPhone users to be undercounted from Sept. 20 to Nov. 30.

Some publishers traffic may have been undercounted by 10 to 20 percent, according a publisher speaking to the Wall StreetJournal.

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The latest mistake is quite damning given the amount of effort Facebook has put into luring publishers into using the platform. Instant Articles load in milliseconds while similar articles posted from third-party websites can take 3.66 seconds, Facebook reported.

SEE ALSO: Math is just too damn difficult for Facebook. What to know about two more measurement errors

Interestingly, it also means that Facebook's strategy to work with third-party verifiers isn't perfect since the company's own code can lead to errors. ComScore did, however, notify the company of the problem.

Some publishers are somewhat forgiving. Dao Nguyen, publisher at BuzzFeed, told the Journalthat Instant Articles drive 15 percent of traffic to BuzzFeed.comand that the majority of its audience comes from YouTube and Snapchat.

Meanwhile, Facebook is seeking to hire an "experienced news executive" to "be a public-facing voice of Facebook and its role in the news ecosystem."

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