Sounds great so far, you seem to be headed in the right direction.
Also, are we able to suggest possible features?
If you're trying to "develop a unique feature or improve vastly upon a feature found on other sites where people demand a better operation", I'd suggest an integrated messaging system. A large part of my, and other people's frustration on social networking sites is when your friends lose interest in the site or aren't online on the site to read a message, yet are on their IMing client. If you can integrate IMing services (YIM, AIM, MSN, and possibly ICQ) into your messaging system, it'd be much more convenient for users to talk to each other straight from your site. An integrated messaging system can also allow for current users to pull in their online buddies that don't yet have an account on the site.
Hope you consider it and can't wait to see your site become public.