Social Wall Application required.

I am developing my personal website and I think it will be a nice idea if I can provide a "Social Wall" component on my homepage. This social wall component should have following features: 1. Allow both Site Owner & Visitors to post short messages(like tweets) that should get posted on social networking sites like Facebook, Twitter, LinkedIn etc. 2. Allow only site owner to post messages(not as limited as tweets) that gets posted to sites like Hacker News, Quora and Stack Overflow. 3. Show all public updates from all my social networking sites on the wall. 4. The interface should be like that of FB Wall. I found an open source application that partially implements these features, only the first one - http://thinkdiff.net/facebook/open-source-facebook-twitter-linkedin-status-update-application/ Do you know if any other applications like this already exist? If not I will develop & release it as open source. Also, what do you guys think about the idea and what social sites you would like to have in such application?