Facebook has been undervaluing iPhone audiences on certain posts by Instant Articles publishers, per its blog post on Friday. It's the fourth time since September that the digital media giant has owned up to providing marketers with inaccurate data, following up on an admission just one week ago.
The newest problem was brought to Facebook's attention by metrics partner comScore.
"We've uncovered an issue for a small group of Instant Articles publishers that impacts reporting in comScore," Facebook said in its blog post.
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