I think my instagram got hacked?

[Jussiland]

quote from http://instagram.com/about/faq/

"How does privacy work?

We have adopted a follower model that means if you're "public" on Instagram, anyone can subscribe to follow your photos. We do, however, have a special private option. In this mode, a user can make sure he/she must approve all follow requests before they go through.

Who can see my photos?

All photos are public by default which means they are visible to anyone using Instagram or on the instagram.com website. If you choose to make your account private, then only people who follow you on Instagram will be able to see your photos".