Bolt in Facebook/Twitter/LinkedIn posting function into CMS

We have an existing CMS which we would like to extend by allowing users the chance to upload news stories straight into their Facebook/Twitter and Linked In pages directly from the CMS system. The current system we have is a very basic CMS system based on a PHP/mySQL model and should be bolted into this system seamlessly. The principle interface will need to have an array of checkboxes to allow the news title to be posted to the Social sites, use the [login to view URL] URL tool to provide an automatic postback and send an ajax style report to the same page informing the user of the success of the remote posts to each of the sites.