It's not all video games, movies and Friday nights (though it could be a lot of that). Single people have a lot to manage on their own - like figuring out what to eat, what to wear and how to decorate their apartment.
You can help them with gift card options that make it easier to use services like Amazon Dash for groceries, buy new clothes and deck out their kitchen.
Without much tying them down, travel is a big life goal at this stage. That means you also have a chance to enable experiences they will never forget with gift cards for airlines, hotels and resorts.
Recommended eGift/Gift Cards for Singles: Amazon, American Airlines, Delta Air Lines, Hotels.com, Cancun Travel Card, Hilton, Uber, Visa