I have nothing further to add, other than to say that the services are free. So they're supported, as reflected in the Office of the Privacy Commissioner's decision in the Facebook investigation, by certain practices and they were found to be in compliance with PIPEDA.
To the extent that your question relates to broader data practices involving advertising, the Office of the Privacy Commissioner of Canada has again shown leadership in coming out with specific guidelines dealing with online behavioural advertising. This is going to be worked in concert with a self-regulatory framework that's being developed by industry to effectively allow individuals to exercise choice in that context.