With the way in which the definitions in the act are worded—i.e., for “commercial electronic message” and “electronic address”—there are features of social media where CASL does capture them. Using Facebook as an example, there's a feature where you can send a direct message to somebody. That would certainly, as an example, be captured by CASL. You cannot send a commercial electronic message to another person unless you have consent or you fall under one of the exemptions, such as family or personal relationships.
On November 9th, 2017. See this statement in context.