Depending on the settings chosen for your conference, a public chat may appear on each session and each exhibitor's page. In addition, there may be custom chat topics set up.
Comments/chats posted to any of these places will appear publicly. In addition, depending on the settings chosen for the conference, they may also appear in the Activity Feed on the home screen of the app or planner. There may be a delay before comments appear in the Activity Feed.
Note: Organizers have the ability to view and moderate all comments. See this KB article for more information.