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In the Consumer Preview, the Share charm was barely used. In the Release preview, it gets more of a workout. Here, I've found an album in the Music app and then used the Share charm, which gives me the option to create a Facebook post or a tweet for sharing with friends and followers.
Windows 8 is tightly integrated with Microsoft's cloud-based SkyDrive file storage service. This Metro style app offers a top-level view of the photos and documents you've stored there.
Want a free upgrade to 25 GB of free SkyDrive storage instead of the normal 7 GB? Go to the "Limited time loyalty offer" page and sign up. And note that it really is a limited-time offer, so do it now.