In Exercise 11.3.14, are the events “a randomly chosen person uses Twitter” and “a randomly chosen person uses Instagram” independent? What would have to be true about Twitter and Instagram users for these two events to be independent?

Data from Exercise 11.3.14

As estimated by the Pew Research Center in 2016, the probability a randomly chosen American adult uses Instagram is 0.28, the probability a randomly chosen American adult uses Twitter is 0.21, and the probability a randomly chosen American adult uses Instagram given that he or she uses Twitter is 0.65.