Tossi is a Twitter-like service in Korea, trying to differentiate itself from the pack by emphasizing on the mobile aspect (quite naturally - the service is provided by SK Telecom, Korea's #1 mobile carrier.)

Tossi is running an interesting promotion to drive usage from mobile devices. The service gives you a daily mission to accomplish, which requires taking a photo with camera phone and uploading the photo to Tossi via MMS.

On the following screen shot is a new mission, "Show us the sky above you now". The winners get mobile coupon for a free Starbucks latte.

It's an interesting marketing initiative, but it can also be an evidence that still not many people are aware of, or using, the Twitter-like service from their mobile phones.

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