Live video streamer Justin.tv followed the release of its Android app earlier this month with Thursday’s rollout of an updated version of Justin.tv for iPhone, which enables iPhone 4 and iPhone 3 GS users to broadcast live video to Justin.tv via 3G or WiFi.

The app features a one-click broadcasting interface; the ability to broadcast and share instantly via Facebook and Twitter; real-time chat within the app while broadcasting; support for the iPhone 4 front-facing camera and flash; the ability to save broadcasts; the option of watching any stream live via 3G or WiFi; push notifications when followed users go live; and the ability to browse live video and search using categories and filters.

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