VIDEO : New Twitter Rule Costs Celebs Millions Of Followers

A recent Twitter crackdown on 'locked' accounts meant high-profile users lost millions of followers overnight.
Business Insider reports that Katy Perry, and Barack Obama each lost more than two million followers.
Donald Trump's following looks relatively unscathed.
Twitter announced on Wednesday that it would no longer include "locked" accounts in follower numbers.
Twitter locks accounts when they display a sudden change of behavior, like sending lots of unsolicited replies.