Final answer:
The fastest method to disseminate ideas widely is through social media, which allows for rapid, global sharing and has a significant impact on social and political realms.
Step-by-step explanation:
The fastest way to spread an idea to a large number of people in today's world is undoubtedly through social media. Social media platforms like and have revolutionized communication, enabling rapid diffusion of ideas and information globally. The impact of social media is significant in various domains, including the dissemination of political opinions, promotion of social movements such as the Arab Spring and MeToo, and personal initiatives like McKenna Pope's petition for a gender-neutral Easy-Bake Oven. Given the pervasiveness of social media usage, it has become an essential tool for both citizens and politicians to express their opinions, coordinate actions, and engage in public discourse.