Yeah, you're right about being enthusiastic and professional. Thanks for the feedback.
As for stats and data, I tend to buy Chris Dixon's argument that narratives are more important than numbers: http://cdixon.org/2010/04/03/size-markets-using-narratives-n... Nevertheless, some statistics are useful.
I included additional details about potential users and what not in my application.
An example use-case, which I didn't get into in the video, is an entrepreneurial designers and developers event.
Here's how it works:
1) Designers and developers RSVP in advance for an online event that takes place at a set date and time.
2) Upon joining the event, each designer is presented with a list of developers in the event with basic bio info from their LinkedIn profile. Each designer can then check off who they want to chat with in the event. The same happens for developers.
3) Once the event starts, they are placed in a series of one-on-one chat with a designer (or developer) that they've previously indicated that they're interested in meeting. During the chats, each participant can view the other participants LinkedIn profile. These chats last for a set time, say three minutes, like speed dating. In the event, participants meet a lot of people that they're interested in meeting in short one-on-one chats. That's the general idea.
There are a lot of flaws with this concept. And I've actually started working on a different idea shortly after I submitted my Ycombinator app, but I still think this idea has some limited potential.