20% of the tweets by Dutch speaking Twitter users is in English

It’s learning for brands and companies, I think. Even your brand is only operating in the Dutch/Flemish market, it becomes important to follow English conversations as well from people living in your market. Next to that: Twitter has no geographical boundaries. We should start to question the regional organizational structure of many companies. Still, a lot of companies try to control communication flows between different markets. Well…good luck!