What does Mitch Parsell mean when he says that online communities with an “extremely narrow focus” contribute to social polarization? 

Describe some pros and cons of online communities. What does Mitch Parsell mean when he says that online communities with an “extremely narrow focus” contribute to social polarization?  Assess his arguments for that claim.  Do you agree with Parsell?  On balance, have online communities enhanced or threatened community life?  Explain.  Please elaborate (beyond a yes or no answer) and provide your “theoretical” rationale in support of your responses. (comprehension).

Make sure you answer all of the small questions mentioned here.

APA format most  and include at least one reference and reference citation to a current event less than 4 years old (a reference with no date (n.d.) is not acceptable) in answer to at least one question.