You can have a whole class conversation in the Post tab of each channel. Messages posted are visible to everyone in the class team, and can include attachments to files or useful web links. Posts can be directed to your tutor or classmates using an @mentions. Type the @ symbol then the name of who the message is directed. If you want everyone to know you have posted type @channel, and everyone will be notified. Posts can also include emojis and gifs if these have been left enabled.