The mammoth social network with 2.7 billion users worldwide has become an essential tool for political advertisers — raking in more than $100 million from the presidential campaigns of Donald Trump and Joe Biden alone. Unlike TV or print media, Facebook allows campaigns to rapidly respond to events, sometimes in a day or less. | The mammoth social network with 2.7 billion users worldwide has become an essential tool for political advertisers — raking in more than $100 million from the presidential campaigns of Donald Trump and Joe Biden alone. Unlike TV or print media, Facebook allows campaigns to rapidly respond to events, sometimes in a day or less. |