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Now that all of your friends have phones with cameras attached, there's probably a ton of links to photos posted in your Twitter streams. Now, there's a new iPhone app that makes viewing all of these photos super simple, without having to click on any links. PhotoNest for iPhone, available for $2 in the App Store, makes it easy to view your friends' photos. Instead of having to visit a site like TwitPic or Yfrog to view photos, use PhotoNet to scroll through them on your iPhone just as you would scroll through any photo album. Plus, you can use the app to take photos and post them directly to your own Twitter stream. If you're viewing friends' photos, simply shake your phone to refresh the photo stream.