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Share or post webpages in Safari on Mac
With the Share button 
, you can share a webpage from Safari using Mail, Messages, Notes, Reminders, and more. If you’ve recently shared with contacts, they appear at the bottom of the list so that you can easily share with them again.
In the Safari app
on your Mac, click the Share button in the toolbar or choose File > Share.Choose how to share the webpage.
When you email a page, Mail lets you choose whether to send it as a webpage, PDF, link, or Reader article (if the page is an article). See Email a webpage shared from Safari.
To choose which items appear in the Share menu, choose Apple menu
> System Preferences, then click Extensions. See Share documents, files, and more.