Congrats on launching something, that first hurdle kills more startups than anything else. As far as the product goes, I agree with the sentiment in the other

Congrats on launching something, that first hurdle kills more startups than anything else. As far as the product goes, I agree with the sentiment in the other comments - I don't see how this is any different to email? Perhaps you could have a feature matrix on your landing page comparing facebook, iddhis and email to show the similarities and differences