When you click the Tweet button, it says “undefined” a bunch of times in the text box. For example:

@undefined How to Add a Custom Twitter Button to Your Website webpop.com #undefined via @undefined

Try clicking Tweet on any of these pages:

  1. Twitter Publish
  2. webpop.com
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Another site with the problem:
http://www.justprofessionals.net/2011/06/twitter-introduces-a-one-click-‘follow’-button-try-it-on-your-website/

Thanks for the report. Looks like this issue was introduced by a recent deploy. We’re actively working on resolving the issue. I’ll report back when there’s more information.

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We’ve rolled back our deploy. Once our rollback propagates through caches, you should no longer see the issue.

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Great - thanks!