Your friends, contacts, email, and photos from all different web services come together in Windows 8 and Windows RT. Connect your accounts from Facebook, Flickr, Twitter, Outlook.com, Google, and more to your Microsoft account, and your photos, files, email, and contact info from those accounts are combined for you in apps like Photos, People, Calendar, and Mail.
For example, say you've posted a photo on Flickr, and now you want to share it with a Facebook friend. If you’ve already connected your Flickr and Facebook accounts, then you can quickly find the photo and share it, without signing in to multiple websites. Your apps work together, so when you share from the Photos app, you choose who to share it with from your unified contact list in the People app.