Los Angeles-based Mogreet, the mobile marketing and mobile video technology firm headed by James Citron, has launched a new product today, aimed at providing monetization of MMS messages. The firm said its new AdStitch mobile advertising service ads pre-roll and post-roll adds to MMS videos, which allows companies to combine advertisements with MMS video messages. The firm said the tool makes it simple for companies to generate advertising revenue from opt-in, MMS messaging campaigns. Mogreet said that it already has customer using the service, including Oakland television station KTVU, owned by Cox Media Group, which is using the service to add advertising to viewers who have opted to receive daily video MMS news from the station. Mogreet is venture backed by Ascend Venture Group, Black Diamond Ventures, Bryant Park Ventures and DFJ Frontier.