In your responses here you state you are aiming this product at the masses.
So I'm going to attempt to review your site from this angle.
Before putting on my typical user hat let me say that I like the concept quite a bit and the site design is very nice.
I am putting my 'mass market consumer' hat which means I'm pressing the back button in 10 seconds unless something good happens.
I see discover. bookmark. share. But these are kind of vague...
(I would A/B test this heading)
But intriguing enough for me to checkout the tour.
Next I see what looks like a movie/slides.
I press play and see the instructions are "click on play icon to view".
I press play and get to the "what is favilous?" slide but then nothing happens.
I don't really see another play button anywhere.
This happens when I remove my mouse from the play task bar and unless I go back over it don't see it again.
The play button to the lower right of the mouse if quite small and hard to see.
Maybe think about either explicitly stating to keep pressing play or clicking the screen to keep the slideshow going or turning this into something more like a movie.
The slideshow itself is of very high quality but the initial slides highlight features.
The entire time I was asking myself... I want to see this thing in action.
Take me through a typical user experience with the app. What can this app do for me?
This doesn't happen until much later on. I would make the slides more into a story about what a first time user would do and how this would be useful to me - a casual user.
Feel free to email me if you have additional questions.