As is mentioned – you can search for and follow these accounts by tapping Profile > Search Instagram > Users and usernames in the app. Some of my favorites are: nasagoddard
photojojo
zooeydeschanel
In fact, there are names like Gucci, Playboy, Starbucks, Levi’s etc. that are actively using Instagram for their branding. As Instagram recommends, you can also find some of our favorite users to follow by tapping Profile > Find friends > Suggested users.