Also new is the StumbleDNA line at the top of your profile, which offers a color-coded representation of your unique combination of interests. Since these easy-to-spot markers are affixed to the tops of all users' profiles, you can use them to quickly determine whether someone else has similar interests. Admittedly, most users will probably ignore StumbleDNA, but power users may find it useful.
If you find something you want to pass along, the built-in Share function lets you send links through Facebook, Twitter, e-mail, or directly to another StumbleUpon user. What you can't do on the mobile app, though, is add pages to a list or comment on items the way you can on the Web. Still, StumbleUpon for Android offers a slick interface, an incredibly smooth user experience, and recommendations that are almost always interesting.