If you wish to auto follow your tweets, please go through the below steps:
1.) SignUp for a new account at TweetLater
2.) Confirm the activation link at your email.
3.) Once validated, login to your TweetLater account.
4.) Add your twitter account details.
4.) Go to the Account setting section
5.) Choose to auto-follow the new followers, send welcome note, and schedule tweets etc.
You can also configure multiple twitter accounts.