TweetTornado is a web app specifically designed to facilitate tweetstorming, or long-form essays broken up over multiple tweets. It's maintained as a hobby project
TweetTornado uses browser cookies to post its Tweets. What this means for you is that all we store on our server is a list of essays published with our service and a list of Twitter usernames that have logged in with our service. Once you log out of our service, TweetTornado does not retain any credentials which we could use to post Tweets on your behalf.
The browser cookies that we use do have Twitter login keys, but we remove those from the cookie when you log out.
As a result of this, every time you log into our service you will be asked again whether you would like to authorize TweetTornado to use your Twitter account. This is by design.