Hey, sign up to SponsoredTweets and make some money tweeting! Sign up today!
The Reason that your should sign up with sponsored tweets is why not there automated system will basically do all the tweeting for you all you have to do is approved the tweets make sure they are related to your niche.
As an advertiser, you also have a lot of control and extra insight into members and campaigns, so you can see and select who tweets your offers, set a minimum follower count and ratio (ie. the person has to have a following:follower ratio of 1 or less), define the maximum cost, opt to include premium Twitterers, and invite specific individuals by Twitter names.