Looks like a nicely executed product, I haven't tested it, but this is the feeling I get from visiting the site.

However, I think you might have two minor problems here:

1) Getting people on the site and let people know you exist. See rmah's suggstion above. Free accounts for bloggers is a good idea at this stage, but not enough.

2) Customer acquisition: Please tell me immediately _how much_ I am going to spend. I won't hook my twitter account with your app, I've come to know your site 10 seconds ago, I won't let you dive through my contacts. I don't even know if this is a paid or a free service. To me this is a enough to let me close the browser tab and look away.