Protect your privacy by automatically deleting posts older than a specified age from your Twitter feed. This allows you to delete all your tweets all at once (up to 3,200 tweets), and helps make it easier to delete multiple tweets in one go.
According to the website most people use Tweet Delete to improve their privacy.
TweetDelete is useful for people who want to reduce the amount of old data in their Twitter account (perhaps because of other apps they use on it) or people who want to limit the amount of data about themselves they expose online. Tin foil hats are optional!
I don't wear a tin foil hat, and I don't think deleting my old tweets protects my privacy. I use TweetDelete because I treat Twitter like a form instant messaging.
Twitter is important to me because of the personal interactions it provides, but I am never going back to relive those old conversations. If I feel strong enough about a topic I will write it down keep and publish it on a website I control. Using TweetDelete is my way of telling Twitter you don't own me.