As you mentioned, there is potentially, or inevitably, going to be some lag time in these kinds of cases, but I think that points to the need to approach these problems from multiple angles. In terms of Canadian citizens having the ability to help identify when information is false or misleading, that would be something that can help fill the gap before there is action taken by any sort of federal agency.
Evidence of meeting #132 for Access to Information, Privacy and Ethics in the 44th Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was interference.
A recording is available from Parliament.