Besides sharing data with other users, you can comment and tag other users to create discussions around particular data. You can add a general comment on a data package to start a discussion. You can also @mention a member of your organization to send them a notification. It is also possible to @mention another member of your organization on a specific annotation of a data package. 

NOTE: You can only create discussions with members of your organization, but not with members of other organizations. 

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