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TwitPic, the service that lets you easily add photos to your Twitter stream, has not only added mobile support since our first review, but there are a few other useful features in its latest release. Along with a new interface design and the obligatory real-time Google map mashup, there are a couple of features that I feel bring additional utility to Twitter and the TwitPic service.
Tagging, geotagging, and RSS feeds not only help you on the self-broadcasting end of the life streaming spectrum, but they also help to better organize the giant mass of content that Twitter has become. I wish pulling an RSS feed directly from Twitter were so easy.
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While it's not readily available on TwitPic just yet, tagging and geotagging also mean that search capabilities will soon be an integral part of the TwitPic service. Combine these new features with the TwitPic API, and there are a lot of ways in which TwitPic is aiding in the Twitter economy.