Instagram is a free photo and video sharing app available on iPhone and Android. People can upload photos or videos to our service and share them with their followers or with a select group of friends. They can also view, comment and like posts shared by their friends on Instagram.

Instagram (@instagram)

You can create a new account from the Instagram app or Instagram.com. If you already have an existing Facebook or Instagram account, you can use your existing account to create a new Instagram account. Both accounts will be added to the same Accounts Center and have access to connected experiences.

There is no right or wrong answer to this question - both are correct! Some people might prefer to say "in Instagram" because it sounds more like you're talking about the app itself, while others might say "on Instagram" because it sounds like you're talking about using the app to post photos.