In 2017, we are using the messaging app called Slack to share conversations, queries, ideas and so on in the course. You will receive an invitation to join Slack during orientation week.
You can download apps for it. It runs on most desktop/laptops and mobile devices. You can download versions of the app here. It will run in a web browser also.
Slack is very easy to use. If you want more help in using it it can be found here.