This document contains three use case summaries:
1) Referring a friend to Groupon to earn $10 in rewards, which involves logging in, selecting a referral method, waiting for confirmation, and receiving $10 credit.
2) Following Groupon on social media like Facebook and Twitter by logging in, clicking links to follow, and receiving updates.
3) Downloading the Groupon mobile app by providing a phone number, receiving a download link, and installing the app to purchase deals on the go.