Of course, besides streaming, you can also broadcast your own content on Ustream to users all over the world using your device's camera. That said, in order to broadcast, you'll need a free user account.
One interesting feature is that you can interact with any broadcaster or those watching your own transmissions. Once you're registered, you can use comments to start conversations with other users.
Ustream is similar to Twitch, as they both permit video broadcasts. But instead of being focused on video games like the latter, Ustream lets you enjoy a wide range of categories, such as sports, animals, technology, music, etc. The possibilities are endless.