1. Build a prototype and get some traction first.
2. Attend some start-up pitch events, like The Hatchery, and learn about what investors are looking for. Your idea, right now, is honestly meaningless without a business plan, projections, or even a website to look at. You don't even have a pitch deck. Go to an UltraLight Startups event. You'll hear others talk and you'll pick up some business skills.
3. Learn how to write. Your writing skills need work. I don't take you seriously, because your communication skills are poor. You can't even articulate what your site will do, how its different and what your competitive advantage is. No serious investor is going to fund a kid who says he has an idea for a social network with nothing to show. Investors want to see that you've made some progress on all fronts. All I see is some kid who joined the list with big ideas, but he's unable to tell us what they are, why they're important, how they'll change the world and how hard he's working on them to accomplish the goal.
You have a lot of learning to do before you start pitching investors. You don't even know what the value of your company is, so how can you work with an investor, when you can't tell him how much your company is worth? An investor needs a valuation to invest at. If your company is worth X, then the investor pours Y in into the company for Z shares of the company.
Say I want to invest $100,000 in your company right now. How much of the company are you willing to give me today. Show me your progress? Where's your deck? Where's your site? How much traffic do you have? How are you going to monetize that traffic? Who are your partners? How are you hosting this site? How will you scale the site? Who is your CTO? Who works for you? Who are your advisors? What technology are you using. What about Facebook and every other social network? What makes you so special? And, what have you ever done to build any web service? What's your background and experience?
If you can't answer those questions satisfactorily, you're not ready for an investor.