Sharing photographs and other images on Twitter is a fairly natural and thus wildly popular extension of the micro-sharing service's main reason for being. We've earlier noticed how TwitPic seems to have emerged as the leader of the pack. Its growth rate is practically up to par with the increase in visitors and users Twitter itself is seeing the past couple of months. Traffic to TwitPic.com has spiked to about 2.3 million unique visitors per month according to Compete stats (which, based on experience, means it probably receives a good deal more) and last night the TwitPic account boasted about having signed up its 1 millionth user . The downside of TwitPic is that it's really not a professional organization, and in fact, is operated by just one guy ( Noah Everett ). Remarkably, he has done a good job of keeping the service up most of the time, but today the service is experiencing some major hiccups. While the website is still reachable, it's no longer possible to log in with your account and all direct links to uploaded photographs have gone dead, with a message saying that the picture in question does not exist anymore (ironically, it suggest other photos under that message, but also with dead links).