Today, the fine folks at 12 seconds have announced the release of a new app for iPhone 3GS users—12cast. 12cast is their first native video app for the iPhone, allowing users to log into Twitter, record, title their posts and share them with friends. The goal with this app was to create an easy and seamless video sharing tool for Twitter. In hopes to get the word out, 12cast has created a contest so easy to enter, well, a caveman could do it. Simply send out a Twitter or 12seconds post with the hashtag #12cast, and you will be instantly entered to win iPhone data service for a year. For every 12seconds post you make with the hashtag #12cast, you will be entered 3 times. The contest ends Friday, August 7th—so get out there and start posting! 12cast is now available free at the iTunes app store.