Ariana Grande is more Insta-famous than Taylor Swift.
Of course, some of the shift might have to do with the fact that Grande is currently on tour, while Swift isn't, as InStyle points out. So she could be earning some new fans since she's been in the public eye more recently. But if you scroll through Grande's feed, it definitely gives off a more playful vibe than Swift's photos do. Grande is known for being seriously silly, with images of herself dressed as, say, a Moonrise Kingdom character. By contrast, even Swift's squad photos feel a bit staged.
Still, we don't expect to see Swift send Grande an invitation to join her squad anytime soon.
Gomez, Grande, and Swift all pale in comparison to Instagram's own account, too. The official @Instagram handle has 214 million followers.