In the wake of U.S. tariffs, one Montreal marketing agency launched a campaign featuring personalized maple leaf ads for Canadian companies to post on social media. One expert says companies will likely have to do more than just talk about how Canadian they are for this strategy to work long term. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS Connect with CBC News Online: For breaking news, video, audio and in-depth coverage: http://bit.ly/1Z0m6iX Follow CBC News on