photoBang is designed to share Photos with your friends by simply Shaking your iPhone/iPod/iPad. To do so: 1 – Both device should run this App under WiFi covered area or "Bluetooth" turned On(for Mac, you need to download "photoBangMac.zip" from http://web.mac.agole). 
2-Select the joining device from the table.
 3-Press "Pick a Photo" button and select the picture for transfer.
 4-Now you see the image displayed, just "Shake it" to transfer Photos. You may both do it at the same time. 
 This app usually retails for $17.99/£12.99 but today you can pick it up for free, just click here.