If you've never used StumbleUpon before, it's a powerful recommendation engine that offers a unique way to surf the Web. Once you start an account, you can use it to discover, or "stumble," upon new Web sites and photos based on your interests and what's trending. The more you use the service, the better it gets at serving up things you might like. Just hit the Stumble button, and when the app offers up a recommendation, give it either a thumbs-up or thumbs-down. Also, you can fill out your profile with your interests to give StumbleUpon's algorithms even more data to play with. And you can always edit your interests -- either on the Web or through the mobile app -- in case you want to add or subtract content types from your recommendations.
With the newest version of StumbleUpon for Android, the updated Home screen offers a cleaned-up experience with dynamic thumbnail links to trending content, past activity, content tailored to your profile, and a tool for stumbling only on specific interests. From there, you can click on a thumbnail, swipe to either side, or hit the big orange Stumble button on the bottom of the screen. As you stumble, you'll see thumbnail previews or pages while their full-size counterparts load. This makes it easy to quickly stumble through several pages in a row. To filter your recommendations by interest or type, use the drop-down menu up top.