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Allowing users to like comments can be enabled from the subsystem setting: Open the subsystem Setting page form the main menu Go to Workflow settings --...

When submitting a comment to an idea, the comment author can tag other users to include them in the conversation. To tag a user, simply type @ immediately f...

There can be 2 reason for not being able to tag a user: The user changed his/hers personal setting in the profile page not to be tagged, as explained here...