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The same works with Facebook. You can post website links or images to your Facebook timeline, and even edit who gets to see it -- including preventing certain lists of Facebook friends. You can even add your location to your statuses.
When you check your Facebook, you will notice the notification comes from "OS X" rather than the in-built Twitter client.
Another new feature added to Safari is the Tab View. If you're using a MacBook Air or Pro, or a Trackpad on the Mac mini, you can "pinch out" and see all the tabs open in a large, snapshot view. The tiles offer live previews so you can switch between pages as things happen.