Think facebook - initially it was only targeted at college students. Start small and focused
- White is boring and dated. If you're afraid of color, try some neutral tones or add minimal color to specific areas (think facebook header, or HN header).
- In 1 sentences below the headline "Share interests..!", explain how exactly your site does what it says it will do. If you think you can't explain it in 1 sentence, start with two paragraphs. Then edit it down to one. Then down to one sentence. http://37signals.com/svn/posts/2647-the-class-id-like-to-tea...
- Instead of presenting the tags in a grid, categorize them. This might seem difficult, but I'm sure you could do it. It is simply unpleasant to browse through a grid of words.
- Mention how quickly the user can begin chatting, and make it prominent. Is registration required? If not, advertise this.
btw im on now if u want to chat