To search for people by photos on facebook (using face recognition)

I am currently working on a basic image search engine project (similar image search). While working on a project, my partner asked with the concept of finding people by photo on facebook. I think the implementation of these concepts in our project will be very interesting. This might not be a security issue since at least the profile pictures are publicly available.

So I'm here with a question: is there already an api or web service available or some software tool that could return the result using facebook face recognition, processing images in the facebook store if the given input is any image of a specific facebook user (which cannot be in the fb store).

if possible i would prefer coding in php, python or java ...........
Or at least hints are always encouraged !!!

By the way, don't pay attention to the language, please !!!