Among the social media platforms, which one has the largest percentage of U.S. users?

Facebook holds the largest percentage of U.S. users among the social media platforms listed. This can be attributed to its status as one of the first major social networking sites, which has allowed it to build a vast and diverse user base over the years. As of recent statistics, Facebook continues to dominate in terms of user engagement, demographic reach, and overall active user numbers compared to other platforms.

Facebook's widespread adoption across varying age groups and its extensive features that cater to personal, business, and community interactions contribute significantly to its user numbers. In contrast, while Instagram, Twitter, and LinkedIn have substantial user bases, they do not reach the same level of overall user engagement and demographic diversity as Facebook in the U.S.