Hi Ian,
Thanks for letting us know about this. The team found an issue in the code
and have been working on a fix. You should see the trends updated over the
next few hours (if they aren't already).
Best,
@themattharris
Developer Advocate, Twitter
http://twitter.com/themattharris
On Fri, Nov 26
polling http://api.twitter.com/1/trends/4118.json
has been returning the same data set since ~ Nov 22
in fact the data set reports
as_of: "2010-11-26T20:18:43Z"
created_at: "2010-11-22T22:13:28Z"
I've retrieved a few other locations and not seen a problem.
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Twitter developer documentation a