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When people construct and share posts on social network sites like Facebook and Twitter, whom do they imagine as their audience? How do users describe this imagined audience? Do they have a sub-audience in mind (e.g., "friends who like reality television")? Do they share more broadly and abstractly (e.g., "the public")? Do such imaginings fluctuate each time a person posts? Using a mixed-methods approach involving a 2-month-long diary study of 119 diverse American adults and their 1,200 social network site posts, supplemented with follow-up interviews (N = 30), this study explores the imagined audience on social network sites. The findings reveal that even though users often interacted with large diverse audiences as they posted, they coped by envisioning either very broad abstract imagined audiences or more targeted specific imagined audiences composed of personal ties, professional ties, communal ties, and/or phantasmal ties. When people had target imagined audiences in mind, they were most often homogeneous and composed of people's friends and family. Users' imaginings typically fluctuated among these audience types as they posted even though the potential audience as per their posts' privacy settings often did not change. The findings provide a list of audience types, as well as detailed descriptions, examples, and frequencies on which future research can build. With people's online presence playing an important role for their reputations, these findings provide more insight into for whom people are managing their privacy and whom they have in mind as they share.

As the abilities to navigate and communicate using the internet increasingly play an important role in our social and professional lives, scholars must stay attuned to what such internet skills entail and how everyday users differ when it comes to such abilities. This article reviews the last decade of literature on measurements of everyday users’ basic internet skills, organizing how scholars have defined and measured the construct, and then systematically presenting what these past assessments tell us about internet skills and their relationship to other factors. Building on this foundation, the review concludes with a research agenda to advance this line of work, including a call for more valid and nuanced measures that capture the added layers of sophistication and sociability needed for today’s internet use.

What motivates young adults to start using the popular microblogging site Twitter? Can we identify any systematic patterns of adoption or is use of the service randomly distributed among internet users of this demographic? Drawing on unique longitudinal data surveying 505 diverse young American adults about their internet uses at two points in time (2009, 2010), this article looks at what explains the uptake of Twitter during the year when the site saw considerable increase in use. We find that African Americans are more likely to use the service as are those with higher internet skills. Results also suggest that interest in celebrity and entertainment news is a significant predictor of Twitter use mediating the effect of race among a diverse group of young adults. In contrast, interest in local and national news, international news, and politics shows no relationship to Twitter adoption in this population segment.

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