Empty usernames
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Some Facebook users who has their names not in English alphabet (use Arabic for example ) will have empty username(just _) using facebook login service. that is because you initialize the user name from the display name (which is in Arabic) and then applying the sanitize_user wordpress function on it will remove all the Arabic letters and endup with an empty username.
I suggest using the facebook username instead of the displayname
if the username is not available, then use the first part of the email address.
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