A study released last week from Experian Simmons proves what most of us already suspect: Americans are flocking to social media.

Among all online adults, 91 percent use social media in a typical month. That equates to 129 million people—or about 41 percent of the U.S. population.

Not surprisingly, the 18- to 24-year-old set is even more invested in Facebook, Twitter, and the like. According to the study, 98 percent of Americans in this age group use social media in a month.

On the other side of the spectrum, 82 percent of 55- to 64-year-olds visit their favorite social media sites each month.

The top reason for using social media? Checking in on brands.

Just kidding.

The actual reason, according to the study, is to communicate with friends. Staying in touch with family members was another primary reason.

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