WHAT: Earn up to 1,000 United miles quickly for some simple links and likes: register at bckstgr.com (400 miles), Twitter Link (200 miles), Facebook Link (200 miles), and Foursquare (200 miles).
KNOW: You’ll see the miles right away in your new Bckstgr account and you’ll likely see them in your United account within 24 hours. You also have the added benefit of completing more “tasks” to earn more miles.
Link: https://bckstgr.com