Can I get a Norwich order against a social media platform to identify an anonymous user in Ontario?

Yes, this is one of the most common modern uses of a Norwich order - seeking disclosure from a social media platform, website operator, or internet service provider of account or connection information (such as an email address, phone number, or IP address) that could help identify an anonymous user responsible for defamatory statements, harassment, fraud, or other wrongdoing. Courts apply the same general Norwich test in this context: a genuine underlying claim, the platform's involvement (even purely as a neutral host), the platform being the only practical way to get the identifying information, and the interests of justice favouring disclosure once the anonymous user's own privacy interests are weighed in.

Anonymity itself is taken seriously as a value courts protect, so an application isn't simply granted because someone posted something upsetting - the underlying claim has to be genuinely arguable, and the request is generally tailored to the specific information actually needed to identify the person, not a broad request for everything the platform might hold about them. Platforms based outside Canada add a practical layer of complexity, since getting a foreign company or foreign-held data to comply with an Ontario order can require additional steps beyond the order itself.