If you're just using Twitter to build out a list of contacts for commercial purposes, that's exactly how you'd use it.  That's how most affiliate-spam accounts grow - they follow as many people as possible, wait a period of time, and then automatically unfollow everyone that doesn't follow them back.  The cycle repeats indefinitely.<p>Many of these Twitter automation tools are primarily interfaces for scammers.  If the tool was built with that in mind, then it carries a hefty price tag.  If the tool's creators were well-meaning but naive, then the scammers get a free ride.  I'd guess that Twitter saw the amount of 'internet marketing' done out of SocialToo and decided to reduce its utility a bit.