Tweetspinner is a very useful service for those of you that have a lot of tweeting to do but only limited time to do it all in. Tweetspinner is feature packed they provide a free services that is more limited or a Pro account that allows you to manage multiple twitter accounts and schedule every service they provide.

• Archiving your DM's and removing spam messages
• Automatic follow backs
• Purge old or abandoned followers
• Automate your welcome messages
• Send targeted follower requests
• Change Twitter profile images / Background / colours automatically
• Schedule future tweets
• Create tweets with variable text that's selected on tweet

{jb_bluebox}Tweetspinner is a great pro twitter tool and very powerful, do read the documentation though so you stay on the right side of Twitters Terms of Service.{/jb_bluebox}