the train to Hogwarts

Idiom. A reference to the Hogwarts Express in the wizarding world of Harry Potter, in which the train would ferry students to and fro the Hogwarts School of Witchcraft and Wizardry.

In common usage, this is an alternative to "the silver bullet" in which "the train to Hogwarts" refers to a medium or channel which could be used to bring a high level (magical) of effectiveness or efficiency.

Social media platforms is not the train to Hogwarts for everyone. Each person's mileage and benefit would vary according to whether the platform suits the person's purposes and intents. It may or may not work for different people and businesses.