Groups in Social Media
Wikipedia defines a group (often termed as a community, e-group, forum or club) is a feature in many social network services which allows users to create, post, comment to and read from their own interest- and niche-specific forums, often within the realm of virtual communities.
Groups, which may allow for open or closed access, invitation and/or joining by other users outside the group, are formed to provide mini-networks within the larger, more diverse social network service.
Much like electronic mailing lists, they are also owned and maintained by owners, moderators, or managers, which possess the capability of editing posts to discussion threads and regulating member behavior within the group.
However, unlike traditional Internet forums and mailing lists, groups in social networking services allow owners and moderators alike to share account credentials between groups without having to log into each and every group.