What positive and negative aspects of community are most enhanced by the internet, and how can it serve to include or exclude people?

Answer question:

What positive and negative aspects of community are most enhanced by the internet, and how can it serve to include or exclude people?

Use this topics as ideas that could be included :
* development of different communities online
    * BBS
    * Usenet
    * BITNET
    * IRC
    * social media/social networking
* digital divide
* web accessibility
    * principles
    * assistive technologies
    * strategies for making content accessible
    * accessibility laws
* trolling
* cyber-bullying laws
* communities built through the internet
Should look like:
-Introduction
-Negative aspects- trolling, digital divide
(Overview, how it include or exclude people , what can be improved)
-Positive aspects- web accessibility, community online (Overview, how it include or exclude people, what can be improved)
-Summary
USE ALL SOURCES THAT PROVIDED !!
SOURCES TO USE:
1) http://webaim.org/intro/

2)http://mashable.com/2013/08/18/digital-divide

3)https://www.washingtonpost.com/news/the-intersect/wp/2014/10/14/the-only-guide-to-gamergate-you-will-ever-need-to-read/

4)https://www.huffingtonpost.com/anita-kamiel-rn-mps/older-people-social-media_b_9191178.html