Thank you! Eventually, we plan to make money through ads and a "Freemium" model, in which users can upgrade to receive access to, say, 15 groups instead of 9, unique color schemes, and certain other bells and whistles that would not leave the Free users feeling left out in the dark.
Hit the sign up screen, then the take a tour link (before signing up). I think this should be more visible from the front page. In general, rather impressive so far.
Currently, we don't support decentralization, though this is a trend I would like to see take hold in the future. If this website gains traction, it would be neat to perhaps allow for integration with home servers, so that people can host their information themselves, if they choose.
The primary difference is the emphasis on groups. We think of the user experience as almost 9 mini-social networks in 1. In addition to our group focus, we also combine groups together into organizations, something that has not yet been done, as far as I can tell.
The reason I say "change everything" is the fact that the naming scheme is completely different, the design has many original aspects, in addition to the new focus of the site: groups.
The tour is, admittedly, pitch speak, but feel free to sign up and check out the site if you're curious to know more!