Communities can be defined as a social group of any size whose members reside in a specific location, share government, and often have a common cultural and historical heritage. Some examples of different communities are practice. Communities that deal with people who are in similar work fields tend to be involved or interested in the same activities. Another good example is action. If certain people within a community feel strongly about a change that they’d like to see happen, they will come together and take action of these issues.
           Systems Theory is defines as the interdisciplinary study of systems in general, with the goal of elucidating principles that can be applied to all types of systems at all nesting levels in all fields of research.
            Virtual Communities are defined as people who interact over the internet, different web sites like chat rooms, newsgroups, emails, discussion board and blogs. If it wasn’t for these different types of virtual communities, people from all across the world would struggle to communicate. They help people every day and I feel that if these were to go away, people would not be able to accomplish tasks throughout their everyday lives. That’s how much importance virtual communities are to people.

Sources:
http://dictionary.reference.com/browse/community
http://www.feverbee.com/2010/11/different-types-of-communities.html
http://en.wikipedia.org/wiki/Systems_theory