It's similar to a problem i had a few years ago when signing up for Airbnb. At the time I didn't use social networks, so there was no way for me to verify my identity except for a baroque, unoptimized process in which i sent a scan of my ID, and even then i wasn't successful. At what point will it become recommended and then inevitably required that people applying for US visas have active profiles from one of the accepted providers?