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Clicking “add a reaction” on a piece of content sends the author a notification, and is useful for letting users know that you've viewed, approved of, or enjoyed a piece of content. Content that receives a large number of reactions appears on the Popular tab of the Activity section in the sidebar. Some sites, especially ones that have external users, may prefer not to have reactions enabled for reasons such as cross-client confidentiality.
By default, reactions are enabled, but a site administrator (see Manage global permissions) can disable and re-enable them for their entire site at any time.
To enable or disable reactions:
Select from the sidebar (under ).
Select or deselect the Enable Likes/Reactions checkbox.