INSAUGA - Oct 22 - Spark, a dating app that launched in Canada last summer, is launching the 'Change My Mind' feature that enables singles to upload a 20-second video stating their opinion on a popularly divisive topic, and other users can respond with a video of their own. One of Spark's recent surveys found 82% of Canadian singles said they are more attracted to people with passionate opinions. The same survey found 70% of respondents said they enjoy debating light-hearted topics with a date, while 73% consider debating with someone to be a form of flirting.