A virtual community, e-community or online community is a group of people that primarily interact via communication meia such as letters, telephone, email or Usenet rather than face to face, for social, professional, educational or other purposes. If the mechanism is a computer network, it is called an online community. Virtual and online communities have also become a supplemental form of communication between people who know each other primarily in real life. Many means are used in social software separately or in combination, including text-based chatrooms and forums that use voice, video text or avatars. Significant socio-technical change may have resulted from the proliferation of such Internet-based social networks.