The customer pays a monthly subscription of around a dollar a day per daily tweet, and most of that money is put back into finding more followers for the account, on sites like Twiends.
Given that there are 240 spots for scheduling tweets, that means that if all spots were filled, there would be about a hundred dollars a day or more going into paying for seeds on Twiends, and other sites which let you "encourage" people to follow.
Most of these people are website owners, or bloggers, people who want to promote something on Twitter themselves. They have no problem with receiving tweets of products and services, and often click on them, if it offers helpful information.
Given that you can't tweet the same thing more than once every six hours, and also given that most people don't have a hundred dollars a day to find followers, it makes sense to share a Twitter account, and build it as a team.
There are other services offered by the site, such as article writing, back links, Facebook and StumbleUpon shares, but for the most part, the Twitter option makes the most sense, and offers the best potential for cheap, effective social promotion.
The actual cost per click on the links you tweet will depend on how much widespread appeal they have to the followers, and how long you stay signed up, as the price remains the same, while the followers list goes through the roof.
You can ask to change the message at any time, (within reason), and to help build it up faster, you can do as much or as little promotion of the site yourself, which puts money back into getting followers.
I have seen many other sites selling tweets, or people offering tweeting services, but this approach to social promotion is unlike anything I have seen, and I think it has the potential over the long term of reaching millions.
Visit http://professionalsocialpromotion.com for more details.
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At Professional Social Promotion, we offer the service of getting your message out to a huge amount of people through social networks like Twitter and Facebook, at an affordable price.