Social network communities facilitate the sharing of identity information in a directed network. Compared with traditional methods for identity information disclosure, such as a campus directory, the social network community fosters a more sub jective and holistic disclosure of identity information. In the following paper, the results of a quantitative analysis of identity information disclosure in social network communities, as well as sub ject opinions regarding identity protection and information disclosure are presented. Through comparative analysis, the need for further analysis of the value and jeopardy of identity information sharing in social network communities is identified.