SnapTweet quickly hooks together your Twitter and Flickr account to notify your followers when you upload new pictures. This works well for those using digital cameras and can’t send immediately to services like Twitpic.
SnapTweet only appears to grab your most recent photo unless you enable automatic posting as found in a small link on the homepage. Most of the photos wil show up within an hour. To manually send a photo:
You can tweet your latest photo by sending a DIRECT MESSAGE to SnapTweet on Twitter with your message. If you send a blank message, we’ll use the photo’s title.
In order to enable automatic posting, you establish a special tag for your Flickr photos (like SnapTweet) and then configure SnapTweet to look for that tag. This way not every photo would go to your Twitter stream, only those you tag properly. A very ingenious way to keep control of what you notify users of without overwhelming them.