Wrong. There are several reasons I don't like the way this service works, and I think they illustrate why many people struggle to understand Twitter. For me, Twitter is about crafting a personal network that shares my needs, which range from education to entertainment - preferably by way of the eclectic. That can only be achieved by filtering my network to maintain quality and minimize noise. I deliberately try to follow people who are smarter than me - so if I follow you on Twitter, pat yourself on the back (but don't rest on your laurels as I have no qualms about unfollowing people who no longer cut the mustard). Autofollow is diametrically opposed to the way I shape my Twitter network.
The second problem I have with SocialToo is that it sends new followers a DM rather than a public tweet. That's not what Twitter is all about - a public arena where knowledge is shared (part of the reason I never follow anyone who has protected their updates). If I want to send one person a private message, I'll use email, not Twitter.
So while I can see limited use for SocialToo in a few specialized cases, I won't be using it for my main twitter account.