You probably noticed that you have the option to leave Internal or External comments.
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Internal - These are comments that will be seen by users of Agorapulse only

External - These are comments that will be seen by users internal to Agorapulse as well as external users via the Shared Calendars
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If you are inviting your clients to approve posts via the Shared Calendars, you can ensure that comments are hidden or shown to them by toggling them as Internal or External, that way the discussions with your teammates can be hidden from clients.