Christopher Gutteridge of the University of Southampton recently suggested that SemanticTweet could support a semantically stable notion of twitter hash tags. I’ve recently implemented and deployed a new version of ST that does just that.
So now, you can use a URI such as:
http://semantictweet.com/tags/%23semantictweet
to represent the #semantictweet hash tag, or
http://semantictweet.com/tags/%23semantictweet+%23rdf
to represent the pair of hash [...]