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TweetDelete : Because you may want to discard old tweets, like you discard old clothes.

TweetDelete is a service which allows you to get your tweets automatically deleted after a certain specified age, from your Twitter feed.

One can delete up to 3,200 tweets at a time (which is a limit imposed by Twitter), and all at once, if one has less than 3,200 tweets. the service is very useful who have a lot of old tweets on their twitter feed from past years and may be would like to reduce their online exposure.

The service also has a very friendly user privacy policy, where it clearly says that apart from twitter handle, screen name and the Twitter API key, it does not store or shares any other user information.