I'm temporarily overloading twitter!? Nuh uh!

I'm getting an error in Twitterific and Twhirl that says:

"Twitter returned a "temporarily overloaded" error. This is a problem with the server that provides tweets to Twitterrific. Please contact Twitter at http://twitter.com/help if the problem persists."

Is this due to something I am doing? I post a normal amount, less than once per hour in most cases. I noticed the problem when I first started using Twhirl, about a week ago.
 
sad I’m sad
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