More than 30 million people use Instagram on iOS. In the world of iPhone camera apps, Instagram reigns supreme, thanks to its simplicity and perfect pricing (it's free, of course!). Because it's so popular, you probably know exactly what it does: Like Camerabag, Instagram allows photographers to slap filters onto their images to make them sepia tone or lo-fi. But what if you don't like filters? Well, Instagram is still a powerful camera app because of its social filters. Thirty million downloads can attest to that. Instagram's real draw is social networking and how easy it makes sharing photos.
Every photo gets a convenient Web link and its own page displaying comments, "likes" and the location where it was shot, if users choose to enable that feature. Instagram taps into Twitter's popularity with the ability to follow other users and see their photos. Best of all, the price is right. Instagram won't change how you take photos, but it will change how you share and consume them.