Instagram users have noticed that their number of followers suddenly dropped overnight.
People were confused and upset, although the scale of followers lost varies.
Make-up artist James Charles says he lost over half a million followers.
Others said they were down tens of thousands.
Instagram has confirmed that the follower counts have changed due to a bug.
Some people had assumed that Instagram staff were deleting inactive users.
Some have been sharing a screenshot of a tweet that looks like it's from Instagram's Twitter account.
But an Instagram spokesperson told BuzzFeed News that the photo that has been circulating is fake.
A lot of people fell for the false image and so far there are 37k posts to Instagram using the hashtag.
Ikran is a reporter for BuzzFeed News and is based in London.
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