BLOG Module Needed for an existing CMS Application

We need a BLOG application which we would like to integrate with an existing CMS system built on C#, .net, Database MSSQL 2005. Our CMS is used for "DO It Yourself (DIY) Websites" where the website is created on the fly for the users who register online. All the sites are hosted on the same server and share a common database. What we need? When a client registers for our website - automatically a blog is created for them on the fly We would like to host the blog on the same application and database server. Multiple users will have their own individual blog which will be managed from our existing website management interface. Each blog will be managed individually. We dont need templates and designs for the blog as it will be a part of their website We need ALL features that a Blog has - with multiple users. We also need Social Networking Features as below: Any entries done on the blog should syndicate the information to the customer's Twitter and Facebook pages. We also need to have twitter, facebook and linkedin widgets in the blog.