If you use Instagram and you updated to iOS 6 or bought an iPhone 5; you may now update. Seeing the first few comments in addition to the likes on a photo in Instagram is actually a palpable upgrade in experience.
Addendum: Something I didn’t notice, because I literally have never used this feature, is that Instagram is "phasing out live filters". Live filters means that when you take a photo you can optionally choose to see how the filter will look even before you shoot the photo. It sounds great on paper but it forced Instagram to create what some feel are less superior filters overall. So, by getting rid of them, they can presumably make better filters and – perhaps – even more filters more quickly? We’ll see.
Addendum /via John Gruber.