I have tried to modify loginURL with replacing www.facebook.com to m.facebook.com (the rest of URL address remains the same).
in WALoginWebViewController.m i write
NSString* lu = [_realm.loginUrl stringByReplacingOccurrencesOfString:@"www.facebook" withString:@"m.facebook"];
Unfortunatelly, the responses from this "mobile" page probably are not correct and therefore the login procedure does not perform correctly...
Probably, certain other modification should be done in WALoginWebViewController.m but I am afraid of lost of functionality of other identity providers.
Regards, Radek.