1. No explanation: A first-time visitor will have NO idea what the site is about. You have a bunch of "Register now" links, but without some idea of what the site is, there's no reason for anyone to register. This is a fairly serious deal breaker that will significantly limit your rate of adoption.
2. Email confirmation sign up: Once again, this will limit the number of people who sign up. Requiring users to first give you their email, and only then register once they've received it, is slow and outdated. I'd remove the confirmation step entirely, but if you really feel you need it you should allow the user to first sign up and only then confirm.
3+ The concept vaguely intrigued me (what little of it I could glean from your confusing videos on the main page), but for this to be successful you need to seriously revamp your site. To be frank, it looks like something made in a previous era of web development.
Interfaces should be easy to use and clearly laid out. Yours does not provide enough information at the start, and presents too many irrelevant pieces upon login.
As in all startups, the ideas behind them could be great, unique, groundbreaking, etc. but if the implementation isn't up to snuff you'll go nowhere.
I realize this criticism may be harsh, but you did ask how to gain a more widespread user base. The best way to gain users is to make the concept easy to understand, and dead simple to begin using.