Tweetlater (now known as socialoomph) is an incredible Twitter Productivity Tool
This is the tool I use along with many others for their auto-direct messages. You can schedule tweet into the future and save tweets as a draft that can be reused later. You can create an extended Twitter profile,do keyword search, view graphs of your Twitter statistics and much more.
You can even advertise your Twitter account on this site to create more exposure and generate followers.
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