I can do this very easily for you. I have a lot of experience in web development. I have been developing websites using PHP,HTML, Javascript, JQuery, CSS, Java, Wordpress, etc. for the past 4 years.
I also have developed about 50+ facebook apps. I can add this selective login using facebook to your site in very less amount of time.
You can see my reviews and ratings.
Please send more details so that I can start working asap. I always write quality code and will code patiently till you are satisfied.
“Client satisfaction is one my main concerns.”