1. Twitter reported a 124% increase in year-on-year revenue. Ad Age reports 89% of that can be attributed to ad revenue, and of that, 81% came from mobile advertising. 2. Mountain Dew tested out Twitter's click-to-call feature to promote Baja Blast, one of the product's limited time flavors. When users tapped the call button on their phones, they heard a recording of spokesperson Paul Rodriguez and then had to leave a message if they wanted a chance to win one of the last ten cases of the product.