Internet Marketing ideas?

[NewArrow]

Press release would give you very little advertising exposure because press releases still have to be ranked high to bring you traffic and so you are by proxy relying on SEO again.
Since its a social website your most long term and sustainable advertising medium should be word to mouth that will happen once you pay attention to usability and making the website friendly and easy to use.
I would strongly suggest you read The Wealth Of Networks, Jochai Benchler or you could contact one Google Analytics certified company like http://www.techwyse.com they could do an expert analysis and come up with an tailor made strategy.