The Share Button
In its never-ending efforts to bring the best of the iPad to the Mac, Apple has built the Share button into many spots. It’s a quick, one-click way to send something (text, link, photo, video) to somebody else (by email, Twitter, Facebook, text message, AirDrop).
If you’ve seen an iPhone or iPad, then you’ve probably seen this Share icon: 
. On the Mac, this button, or a command that just says Share, pops up in all kinds of programs: the Finder’s shortcut menus. Quick Look panels. The Open File dialog box in Apple programs. OS X programs like Contacts, Notes, Preview, Safari, Photo Booth, TextEdit, Photos, and so on. Other companies can add it to their programs, too, or install new commands into the Share menu for transmitting stuff to new channels.
To use this feature, select or open some text, a photo, a video, a file icon, a web link, or something else that you want to send to friends. When you click this button or command, you’re offered various ways to share the selected item. The choices vary according to the program you’re using, but here are some examples:
Email. The Mac copies the selected material into a new, outgoing email message, or attaches the selected file to an outgoing message. Just add a few explanatory notes, address the message, and send.
Twitter. Opens up the Twitter share sheet pictured in Figure 5-12, middle. A counter helps you keep your message ...
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