From Pew Research:
Latinos, blacks and whites use social media networks about equally, but there are some differences in their preferences for specific social media sites. For example, Instagram is more popular among Latinos while Pinterest is more popular among whites, according to a late 2014 Pew Research Center survey.
Today, about eight-in-ten Latino, black and white adults who are online use at least one of five social media sites – Facebook, Instagram, Pinterest, LinkedIn and Twitter. Among these, Facebook stands out as the most widely used platform, regardless of race or ethnicity: About seven-in-ten adult internet users (71%) say they use the site.
But there are differences by race and ethnicity in the use of other social media sites, in particular Instagram. The photo-sharing site is more popular among Hispanic and black internet users than among white internet users. About one-third (34%) of online Hispanics use Instagram, as do 38% of blacks. By comparison, only 21% of whites use the network.
Read the rest at Pew Research