TweepMe allows you to register and pay a onetime fee. Once you have surrendered cash, their system auto-follows everyone else that has paid and adds you to their lists. You end up following and being followed by people that paid to be followed and to follow others. Welcome to the pyramid scheme.
When a new member joins, every other member automatically follows the new member, and the new member follows them back. The process is gradual and happens over the course of weeks or months depending on the number of TweepMe members.
I sense a blog roast coming on this.