Facebook login and grab info

I have a website script created by another freelancer that has a form that takes some info from users. This info includes a facebook address and their email. This is saved into a database. I have an admin panel where all submissions are listed. Currently, the script will attempt to automatically grab their username and full name, but this only works for member who have public privacy settings. Unfortunately, this is only for about 10% of members. For the rest I am given a link to their profile page, which I need to click (whilst logged into my facebook account) to see their username and full name. I then manually copy this username and full name into the textbox on the admin panel for each request and then click 'submit', this sends an automated email which includes their facebook username and full name. What I want you to do is adapt the script so it can find all member usernames. When the user submits the form, I want it to automatically log into a facebook account and then grab their username and full name. This info then can be saved into the database and shown in the admin panel, ready for me to click 'submit' and send the email. To win this bid you must know exactly how to do this and confident in making a script that can log into facebook using a test account. You must also be aware of any anti-bot features that facebook has and a work around plan for any captcha codes etc. I am happy to enter captcha if need be in the admin panel to make the request go through. Message me if you need more details.