Company need to manage employee's knowledge [Drucker, 2000] because of the knowledge become the key competitive advantage for companies [E. Murray Jennex, 2007]. Given the importance of knowledge, the knowledge needs to be managed properly. Knowledge management is not only an impact on the development of the economy, also affect the progress of information and communication technology, the knowledge will ultimately create new knowledges.

Knowledge serve as social capital for the success of the company [Don Cohen and Laurence Prusak, 2001]. Knowledge also the intellectual value for each individual or organization to improve the quality of the individual or organization, particularly the quality of the results of each work implement.

In conducting its work, often experience conditions in which each application of the procedures that work there can not be implemented in pure, but based on field conditions. Given the differences in location or work area can determine the method of handling is also different. Therefore, any differences in the handling needs to be noted as detailed in the documentation that will be used as guidelines, and will be used again for a job in the same area or other work in a different area with the same condition.

Method documentation of each company is different. Problems arise when companies need the latest information quickly and easily, the information changes that occur in every work pelaksanakan.

Because companies can not manage the knowledge of its employees, it will be a problem, because current knowledge is not divided in a rapid and comprehensive.

This will not happen if the available media to share information or knowledge sharing, namely media that supports the process of change from Tacit knowledge to explicit (Externaliazation) and explicit to explicit (Combination) [Nonaka and Hirotaka, 1995]

The desire to share knowledge would need to presented in such a way so that the interest to remain always share. Therefore, the concept of Social Network as used by Facebook and other social network system will be the appropriate method at this time to increase employee participation in the sharing of knowledge (knowledge sharing) [Harvey Jones, Jose Hiram Soltren, 2005]. Dengen concept of social network also will create interaction among employees [Aris Anagnostopoulos, Ravi Kumar Mohammad, and Mahdian, 2008].

Facebook appointed a study by Fabernovel Consultan said that since launching the first time on 24 May 2007 to 25 September 2008 have joined 42 million active users. This explains that Facebook has become a social networking site (Social Network) the second largest globally after MySpace. Facebook statistics say that at this time already have more than 175 million active users Facebook user. [facebook.com].
Writer: Agung Sr.