Chapter 6 - Percent - 6.4 Using Proportions to Solve Percent Problems - 6.4 Exercises - Page 420: 52

68 percent

We see that 32 percent of American youth use Twitter as part of their social media. Thus, the percent of Americans who do not use Twitter as part of their social media is: $$ =100\text{%}-32\text{%} \\ =68\text{%}$$