Fred Stutzman is a Ph.D. student and teaching fellow at UNC's School of Information and Library Science - he keeps a fabulous blog called Unit Structures. In a post today, he answers the question:
From Rob...
How many US adults are actually using social networks ?
Using a variety of sources, he estimates that 22% US population over the age of 18 is using some type of social network. Here's the data by age group:
US SNS users aged 18-29: 34,251,555* (Total population 18-29: 51,121,724) ~70% penetration
US SNS users aged 30-39: 8,599,930* (Total population 30-39: 40,952,050) ~20% penetration
US SNS users aged 40+: 8,235,988*,** (Total population 40+: 137,266,473) ~6% penetration
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