So Perez put this article where you can basically see who has the fakest followers and who's actually the most followed (Katy's actually 9th) so Taylor's the most followed? Out of Taylor's 84m 74m are real and 12% of her followers are fake, Selena's 47m is actually 26m and 44% are fake, Demi's 43m actually 27m 37% are fake, RiRi's 73m is 27m 63% are fake, Harry's 30m are 22m 24% are fake. And this one, I knew she bought followers but WOW. Out of Katy's 99m, she actually has 31m and 68% are fake.
You can tell based on if the number of likes/RTs someones tweet’s get don’t correspond well to their follower count because bots usually don’t interact.
Katy has 99 million followers and her tweets get like less than 10k RTs and less than 20k likes on average. Taylor has 84 million followers and gets like 10-25k RTs and like 25-50k likes. Big difference.