I didn’t think I needed another iPhone photo app, but turns out I did. Instagr.am mimics other mobile photo-sharing apps, but it’s captured the appeal that comes from extreme minimalism. While you can use it to cross-post to other sites (Twitter, Flickr, Facebook, Tumblr, Foursquare), the web-side is pared down to just the photo page. There isn’t a link to a user profile, no view to more photos by the user, etc. The world of Instagram happens on the iPhone and because of it, it’s a little, pocket-size world of streaming images from those you follow. I’m seeing friends that rarely post photos to Flickr or Facebook suddenly posting 30 photos a day on Instagram. It’s addictive for both production and consumption.