Mentions (often known as @mentions) are a seamless way of drawing someone's attention to a page or comment, or assigning a task to them. When you mention a user, they'll receive a notification by email and in their workbox; if you mention them in a task, the task is assigned to them and appears in their tasks list.
You can use the 'Share' option in Confluence to email anyone a link to a page or blog post. The recipients can be Confluence users or any email address(es).
The Confluence workbox
displays all notifications collected from Confluence page watches, shares, mentions, and tasks. From your workbox you can reply to comments, like a comment or page, watch a page, or open the relevant page or blog post.