Twitter clone with different design and features,

When i say "twitter clone", i refer to the new twitter [login to view URL] I need a twitter clone with these requirements: The website will feature groups defined by admins. Users can become member of any groups. Users can make posts but must specify which group(s) will see their [login to view URL]'s mandatory. I dont need these twitter features: "Direct messages" and "trends". Reponsive design The design should be compatible with smartphone interfaces. [login to view URL] The website is to be with high speed of execution, stability and scalability. The site should be optimised so that it would be able to handle very high traffic, to handle more than 1 million members. We want a unique design. So a talented designer is needed. His portfolio would be appreciated. Examples of your similar work would be appreciated.