Social Commerce ???

I have been thinking allot about how to incorporate Social Networking into our new E-commerce based membership startup...forums/classifieds/member pages etc.. are all the likely suspects. The problem is that we have to build a vibrant community first..so how do we do this and get some sense of relationship building?

It seems like their are multitudes of options out there whether it be a tools Meebo, Twitter, Stumbleupon, Me.dium and leveraging other social networking sites like Myspace , Facebook , Youtube and Flickr.

This can get intimidating quite quickly but I think that I have come up w/ a scenario that will make it easy for members to interact w/ our staff and other members in an efficient manner.

Can you have a site that incorporates a mix of Social Networking tools but doesn't have the typical infrastructure i.e forums, chat rooms, member pages?

Could we mesh the ability to use tools like Meebo which blends all major IM's (Gtalk,AIM,YIM,MSM,Jabber) together in a web based widget instead of using LivePerson?

Second would be how can we take that to the next level..a blog would be nice..but our demographic audience are primarily 18-27 males.. so we need to keep it short and simple. I came across this article from Lifehacker regarding real world applications for Twitter. Twitter is an application where you can post quick blurbs about daily happenings in your life and are sent via Sms, IM's or Blogs.

The key in my mind is somehow to use these tools to make a bridge between our site and the big boys i.e Youtube/Myspace/Facebook/Flickr.

Our strategic marketing plan is to develop relationships in community forums that are specific for our startup. Could we find a way to incorporate a community based off of Me.dium
that would give our members and fellow enthusiasts to socially surf? Maybe this is taking it to far.

Let me know what you think I should do regarding a "Social Networking Strategy"