“Do you have any interest in selling? My contact information is attached.” A text message to potential sellers may not work for every market, but Jim Manning, co-founder of STL Real Estate in St Louis, is finding some success with a campaign he recently launched. The marketing effort was designed to identify potential sellers in the popular residential market of Tower South Grove. But you won’t find a robot behind the keys, perhaps just some tired thumbs. The team’s text approach didn’t rely on automation.