it’s not mandatory to enter a real name at flickr, a nickname is sufficient. if bridgy encounters a user with no real name given, it should not reurn an empty name, but the nickname.

example:

• user with no real name: https://www.flickr.com/photos/kikus/
• nameless result: https://brid-gy.appspot.com/like/flickr/92049783@N06/20987343809/84636483@N00

(as far as i can see, instagram backfeeding works like this)