Build a Website -- 2

Hi, I have an existing website develop in PHP using codeigniter 2.3 framework. For this website, i want to add following basic functionalities: 1. Posting on a given url of facebook page (for example: [login to view URL]) on behalf of the user's facebook account after getting permission from the user using php-sdk-4 2. Posting on a given url of facebook page (for example: [login to view URL]) on behalf of another facebook page such as "[login to view URL]" using php-sdk-4 3. Posting on a twitter user on behalf of the user's twitter account after getting permission from the user using twitter php sdk 4. Developing a Popup Login form with Signin and Singup option as given example below: [login to view URL] It is ok if you develop all these functionalities as standalone application comptiable with php codeingnite framework. Then we can integrate them together. As i am also a computer engineer, i can do to the integration myself based on your instructions.