In the world of scientific communications, social networks can be considered as effective tools for creating knowledge and sharing ideas. The objective of social networks is to promote knowledge through providing connections among individuals and forming social capital. The aims of this study are: i. to acknowledge the type of knowledge communicated in Library and Information Science Discussion Group (LISDG), and ii. to investigate the extent to which the LISDG is capable to establish social capital. To fulfill the first aim, the content analysis was used to analyze 1400 messages in an established social network. The findings show that although most of the messages sent to the LISDG (about 82%) are of Know-What type of knowledge, the numbers ofKnow-Why, Know-How and Know-Who types have been increased during the two years period of study. Survey study and questionnaire were used to fulfill the second aim of the study. The results indicate that LISDG possesses required characteristics such as trust, reciprocity, social support, suitable environment, commitment, cooperation and efficacy for being regarded as a social capital.

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