It's very simple. You just choose when you want your tweets to be automatically deleted (e.g. when they are one year old, one month old, etc.). Then you will be able to choose from a list of restraints to ensure some tweets are not deleted.
Tweet Sweeper is a simple service that automatically deletes your old tweets. Twitter is a fantastic place for real-time conversation, it just lacks nuance or context. And we're constantly learning and growing.
Search A Year lets you just search for anything, but can target current, or historical years. As simple as 1-2-3. 1 - Type the year you want to search 2 - Type the term you want to search 3 - Hit enter and voilá!