Our courses are often taken by many thousands of students, spread across the globe. Because of the large number of learners on these free courses and the limited time of the educators, educators can't reply to every comment or speak directly or privately with learners.
Some educators will also be supported by teaching assistants and PhD students who will also interact with learners as part of the discussions, and help guide learners. These will be identified with a ‘mentor’ label next to their name.
We know our learners are great at helping each other out - if you have a question, other students may well be able to answer you.