Social-networking sites like Facebook enable people to share a range of personal information with expansive groups of ''friends.'' With the growing popularity of media sharing online, many questions remain regarding antecedent conditions for this behavior. Contingencies of self-worth afford a more nuanced approach to variable traits that affect self-esteem, and may help explain online behavior. A total of 311 participants completed an online survey measuring such contingencies and typical behaviors on Facebook. First, exploratory factor analyses revealed an underlying structure to the seven dimensions of self-worth. Public-based contingencies explained online photo sharing (b ¼ 0.158, p < 0.01), while private-based contingencies demonstrated a negative relationship with time online (b ¼ À0.186, p < 0.001). Finally, the appearance contingency for self-worth had the strongest relationship with the intensity of online photo sharing (b ¼ 0.242), although no relationship was evident for time spent managing profiles.

Many have questioned the reliability and accuracy of Wikipedia. Here a different issue, but one closely related: how broad is the coverage of Wikipedia? Differences in the interests and attention of Wikipedia’s editors mean that some areas, in the traditional sciences, for example, are better covered than others. Two approaches to measuring this coverage are presented. The first maps the distribution of topics on Wikipedia to the distribution of books published. The second compares the distribution of topics in three established, field‐specific academic encyclopedias to the articles found in Wikipedia. Unlike the top‐down construction of traditional encyclopedias, Wikipedia’s topical coverage is driven by the interests of its users, and as a result, the reliability and completeness of Wikipedia is likely to be different depending on the subject‐area of the article.

Humans always find themselves involved in social groups. Today, these groups are routinely mediated by communication technology. Web 2.0 -the social web-is characterized best as the set of tools that facilitate production and distribution of content produced by everyday people. In particular, there is currently pervasive interest in the relationship between this content, (online) social networks, the nature of people's relationships mediated by websites like Facebook.com, and the changing role people now play in the production and consumption of mass-mediated messages. Considering that sites like Facebook.com facilitate the accumulation of expansive networks of acquaintances, there are pressing questions about the relationship between the characteristics of online networks, access to social capital, and outcomes like psychological wellbeing and access to resources embedded in these networks.Social networks are the conduit for the entirety of human social behavior and are comprised by a range of relationships with varying qualities. Granovetter (1973Granovetter ( , 1982 was the first to formalize the nature of relationship strength in social networks by arguing that social networks consist of relationships ranging from very weak in strength to very strong. Weak and strong tie relationships afford access to

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