The concept of cloning a website is a easy way to get easily in the market to make some revenue  or to use for personal help,there are thousands of free scripts which looks quite similar to the original site,you can purchase those Clone scripts from auction site,stores or use open source products.

The benefit of open source is that anyone can use,make modification as it is free of charge,so here are some of the twitter open source clone script which can be uploaded on your server helping you to make your very own microblogging service on the web world.

Yonkly Twitter clone

Apart from being a twitter clone Yonkly a free twitter type script application which is built with ASP.net MVC has a additional feature of threaded messaging which was absent on Twitter. The installation steps are easy compared to other twitter clone installation and is being updated consistently.

Download source code (More info)

Laconica clone script

This is a smooth twitter clone which also allows members of a different site to subscribe to the user’s updates from another site running the same script.

You can find more information about download and installation of this clone script here