While many countries are in phased lockdowns, universities have been challenged with moving learning content and material in an online format to their respective learning management systems (LMS). These LMS's usually have built-in tools for email, chat, blogs, forums etc.
Many educators have been creative and have created other shared platforms to encourage participation. For example, I have had successful weekly check-ins with my postgrad honours students on our Whatsapp group. Which methods have you been using? How are you experiencing the communication levels of students? Which advice do you have for encouraging active participation?