Directory submissions, Link Building , Buying Blog posts and links , Social Bookmarking , adwords.... Do u still want more tactics??
Ace is right, and this looks like a myspace spinoff, you will need to link to sites and purchase ads on sites that relate to your target market.
My .02 is that.. your site tries to cater to everybody. Instead, try to cater to let's say business networking or music networking and then market it in forums and other related sites..