According to Flickr’s camera usage statistics, the iPad 2′s camera is used by very few people — only 23 active daily users. And so far, 12,811 photos have been taken and uploaded to Flickr with the device.By comparison, the iPhone 4 has 4,402 daily active users; more than a million photos have been taken with the device. We don’t have exact numbers of iPad 2 sales, but the tablet has been on the market since March 11. According to Apple, strong sales have resulted in a record-setting quarter, with analysts estimating that about half a million devices sold in during the iPad 2′s first weekend on the market.