Show HN: Postcard - An Open Source Social Networking Platform for Website Owners

Hi Everyone,

Today I'm proud to announce the upcoming launch of Postcard. You can visit the launch page here - http://www.postcardsocial.net

However, since this is Hacker News, I thought the community might be more interested in my blog entry which explains in detail why the project should be of interest to developers including information about the open API Protocol it will adhere to.

You can read the blog entry here - http://blog.postcardsocial.net/introducing-postcard/

Feedback is welcome and appreciated. I'm actively looking for beta testers and you can sign up on the launch page.