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Online Discussions Spaces, quick and easy to start
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Interesting way to add more information to a blog post. You could have a running blog that has fields when you add a new entry for distace, location, speed, etc. Then the information for the posts can be aggregated into graphs, maps, etc. The blogs are
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Jordan does a good job profiling some popular web apps and how they used their community to build value (in contrast to traditional business models)