How can Teachers follow their students' progress?
How can I best know and track my students progress as a teacher?
This site has nothing to do with facebook...
Just ask them what their username is on Duolingo (assuming they are your students you should actually see them face to face...) Then write it down. When you are on the Duolingo Website, Click the button at the top of the webpage "Follow people", Then click the "Search" Tab, and place their username in and press search. If they do not know their username, ask them for the email they used or get them to check before you see them again.