"We’ve all been there. You’re Stumbling on your iPhone while you’re on the bus to school, but right when you Stumble upon the MOST," says associate product marketing manager Katherine Kramer. "AMAZING. PAGE. EVER, it’s time to stash your phone away and head to class. If only you could have saved that page by adding it to the awesome List you just created on StumbleUpon.com, right? Well, today is a day to be thankful for."
"You’ve probably Liked TONS of pages on StumbleUpon, and Lists give you the chance to organize all those pages into personalized collections that are meaningful to you," she says. "Whether you’re into Fitness or Architecture, sharing your Lists with your friends helps you express yourself and show what you’re interested in and knowledgeable about. And with Thanksgiving and the holidays right around the corner, creating Lists like Nuffin’ But Stuffin’ or Make It a DIY Holiday is a great way to start planning for all the festivities! If you’ve never created a List before, we’ve helped you get started by automatically gifting you a “Save for Later” List, where you can keep all those amazing Stumbles to go back to later."
Here's a tutorial video StumbleUpon recently put out about using lists:
The company says that users have already created over 200,000 lists.
StumbleUpon users with Android are still waiting on the company to release an updated Android app.