Linked Last
Linked Last is a service that provides you with a QR code that always forwards to the latest tweets for a user/hashtag.
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If you write a simple tweet with no link inside it, then the QR code simply forwards to the tweet itself.
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If you have a link in your tweet, the QR code will forward to that link.
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If you have more than one link, it chooses the last link to forward to...
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If you want to use a hashtag, the QR code will link to the last tweet (or last link in the tweet) with that hashtag.
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This works by linking a QR code to a bit.ly link, which links to a url on this site, which dynamically links to tweets or links inside tweets.
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If you want you can access the dynamic links on this site in a RESTish way... like http://linkedlast.com/twitter/USERNAME/OPTIONALHASHTAG
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If you want to track a hashtag with a QR code, from any user... then this format http://linkedlast.com/twittertag/HASHTAG/
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Try http://linkedlast.com/twitter/fredtrotter/
as an example dynamic link from the user @fredtrotter.
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Try http://linkedlast.com/twitter/fredtrotter/healthit/
as an example dynamic link from the user @fredtrotter
only matching tweets with the hashtag of #healthit.
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Try http://linkedlast.com/twittertag/occupy/
as an example link from any user with the #occupy hashtag.
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If that sounds confusing... just give it a try!!
This is a Trotter production send me an email with comments, bugs, and feature requests.