Ok, here is a the big mistake that lots people make. You need to have the Community first then bring the software/your site to the community.
Either a physical community of people that actually know each other in the "real world" like YouDidntDidYou.co.uk or a community of shared interests ie Boonex is a community of people with a shared interest in bring communities together. Otherwise its not just going to happen people just aren't interested in joining communities for the sake of it.

Dolphin/Hookie see more is just a tool for bringing a community together, it doesn't create one out of thin air.......