Fixed ongoing issue with follower/following counts.
In December 2014, we fixed an ongoing issue that incorrectly included inactive or fake accounts in follower/following lists, so some people may have noticed a decrease in their follower/following counts. Keeping Instagram authentic is important to us, so we do our best to remove spam, fake accounts and other people and posts that don't follow our Community Guidelines.
Note: This issue was fixed for the majority of Instagrammers in April 2014. By the end of December 2014, it should have been fixed for the remaining members of the Instagram community.