I wanted to clean up my twitter account but found it hard to delete old tweets. With a bit of fooling around the solution turned out to be super simple!
Go to Snapbird.org, a little online tool that allows you to search all your old tweets. With this finding the tweets to delete is simple (using the excellent search funtion). Under each of the tweets listed you’ll find a date- and time stamp, click on it and it will lead you straight to that specific tweet in Twitter. Press delete and voila!
Hope this helps! It is a lot easier that the incredibly complicated solution presented at the Yahoo website. When you’re done, hope you have fun browsing my site for some cool photos.