My site (http://sukabumi-marketplace.com) using facebook graph for user login. I haven’t maintenance it for the last 2 months. when I try to login few days ago it return an error because the username from Facebook graph API was empty.
I googled why this is happened. and got that facebook has depecrated the /me/username API. alternatively we can use email as username. but I resist to use facebook username as my application users username. so I do some trick.. seems stupid but it works.