after watching the video I don't see anything you do that google chat doesn't and quite a lot of the reverse. I wish you all the best but the reason you're having difficulty in differentiation perception is because the products are all very similar.

Having build a chat system, the real problems don't start until you have scale. I'd hate to be using this in a real work environment only to have it fall over when there's a lot of users. Chat is the only time I've ever had to write Erlang code.