If you have heard about the new and secure Social Network named diaspora from joindiaspora project. Its currently on Alpha phase and no more signups are allowed. But if you still want to check out the features and look of the project. You can download a Diaspora Live DVD which is based on Ubuntu and can be tested on any PC.
This is a unofficial Diaspora project created by Michael Chrisco and the project is hosted on GitHub Unofficial-Diaspora-Live-DVD Page
The current version of Diaspora is “Diaspora Alpha V0.08” and you can download the Live DVD image format with two options(Direct Download or Torrent). You may choose the option that suites you.
Direct Download: – http://diasporatest.com/diaspora/diaspora_PreAlpha_V0.08.iso
You can get the latest download from DiasporaTest Wiki Page.