The Groups methods in version 2 of the Elance Developer API obtain details pertaining to user communities on Elance.

groups
Returns a full list of all current groups on the Elance system.

groups/{groupId}
Requests information pertaining to the specified user community, including the group's name, description, and logo.

groups/{groupId}/members
Requests a list of all of the Elance members who have joined and been approved for membership in the specified user community.

groups/{groupId}/jobs
Requests a list of all open projects that might be of interest to people who belong to the specified group.