If you are looking to clean up a clogged up Twitter account, like the people asking questions here and here, this utility might be just what you are looking for (make sure you note the deletion caveats mentioned in those links though):
Announcing TweetDelete, the Twitter Mass Delete / Cleanup Utility that helps you mass-delete Outgoing Tweets, and Incoming and Outgoing DMs.
This is a very-much-beta version, and donationware. Use the feedback form if you find any problems (which I'm sure there are plenty), and if it proves valuable to you, feel free to donate to the cause.
Download TweetDelete here. No install required -- just download and run. : )
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(Later Update: Having some issues with the update server; if you get in an endless loop of "checking for updates" clicking "Next" on the welcome tab, you can skip to the login section directly via the numbered tabs at the top. Should be squared away tomorrow if it's still a problem).
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Update: New release (minor edits, modified expiration date) released today 07/20/2009. Apologies to the folks who got caught by the expiration period.
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Update: 08/18/2009 Users have recently begun reporting "mo Messages found to to delete" as the result they are getting, and I now get the same result here. Looks like Twitter has changed their API, blocked this app in some way, or something along those lines.
Given the minimal support/contributions this app has received thus far, it's not high on my priority list, but I do plan to look into it eventually. Currently this app appears to no longer work, due to changes in the Twitter service.
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Update: 09/21/2009 A number of daring souls have tried the app in its current form anyway, and feedback comments (built into the app) seem to indicate positive result. Your mileage may vary, but feel free to try it out, and let me know how it works for you.
Nice job, works perfectly. Thank you!
Posted by: scott | May 07, 2009 at 05:10 AM
WHY? It says it is expired and no new updates and no login section either. please, i need you. come back.
Posted by: punkin | July 10, 2009 at 07:02 AM
This doesn't work for me. I've tried it several different ways from two different computers and it always just says "No tweets found to delete." Have emailed, but have received no response.
Posted by: JenB | August 14, 2009 at 03:04 PM
Worked for me, thanks. I had to use this to clear onr of my zombie accounts that I decided to use legitimately.
Awesome awesome tool. 6 Thumbs up
Posted by: mikhail | September 21, 2009 at 02:10 AM
says no tweets to delete
Posted by: tracey | September 30, 2009 at 05:57 AM
Wondering if you can just delete @ replies you have sent? I am wanting to make a public account and remove any personal @ replies I sent.
Posted by: Stevie B | October 25, 2009 at 08:41 PM
this program is not accessible tothe visually impaired. i an get tot he part where you select what you want and the software says to select what you want to del and I ca't see to do that. I thinkt he edit combo needs to be made in to a combo box for easier use.
Posted by: sarah alawami | November 25, 2009 at 04:16 PM
I also get no tweets found!
Posted by: bbrian017 | December 08, 2009 at 08:43 AM
not working
Posted by: chandresh | December 09, 2009 at 03:21 AM