Comparing Fractions — Process & Examples

There are only two ways that you can vote for your favorite artist for the American Music Awards, via their site or on Twitter. Justin Bieber, who won 4 awards this year, has the 2nd-most followers on Twitter. He used to have 78 million Instagram followers before he deactivated his account this year. Which of these nominees has the most extreme discrepancy (as a ratio) between their number of Twitter and Instagram followers?