Nice! I was preparing myself for a rant against yet another proprietary "decentralized" platform, when I read that this is GNU Social compatible :-). This is great, maybe some more (compatible) competition will do the network good. The current offerings like GNUsocial are not quite as polished as e.g. Facebook and Twitter.

One little suggestion, I can't see anything of your network when I visit the main page. I'm hesitant to sign up for something if I can't see it. Maybe you could add a list of users of the instance / network, public tweets, etc. Or even better, publish a link to a (public) profile, so users can get an idea what it looks like in use.

(If I'd make a federated microblogging / social network site, I would center it around the profile page. I'd make it at first glance less about networking and more about presenting yourself. Like the early Facebook, or MySpace. This way, a user has an incentive to sign up even if no or only few friends are on the network yet. You'd be able to customize your page a lot, leave contact data, write (micro) blog posts, have a wall (guestbook) etc... And almost incidentally you'd be able to use your identity to comment on GNUSocial, use XMPP, OpenID, ....)