From the Instagram FAQ

>Instagram is a fun and quirky way to share your life with friends through a series of pictures. Snap a photo with your mobile phone, then choose a filter to transform the image into a memory to keep around forever. We’re building Instagram to allow you to experience moments in your friends’ lives through pictures as they happen. We imagine a world more connected through photos.

I’m annoyed by the photographers who post Photoshop edited DSLR photographs to Instagram to obtain lots of followers.