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Knowledge sharing social platforms where users mutually benefit through question-answering are gaining popularity. The success of these platforms on the web has led to their adoption within the firewalls of enterprises also. In this paper we have presented some in-depth study about two such platforms -- one open on the web and one which is within an enterprise to identify the similarities and dissimilarities of user behavior in the two platforms. We have proposed an algorithm to predict experts to improve the effectiveness of such platforms.