Don't understand what these NB icons are/do

question
1

nb-22-05-2024 22-38-28

nb-22-05-2024 22-36-25

22-05-2024 14-00-47

  1. This Sharing function. just WHO/HOW is it ‘shared’?
    nb-article-view-footer-options-22-05-2024 22-44-27