i) minimizing cost / number of personnel needed.
ii) Reducing amount of equipment (printers) because of LAN marketing. iii) Fun - online games, Internet, music, graphics.
iv) Communication. More ways to communicate globally.
v) Education - access to info for analysis.
vi) third world - cheaper to supply laptops thean to send ebooks over (OLPC, etc)..
i) Hardcore porn sector (including child porn)
ii) Hackers, ID fraud and spoof websites,
iii) Virusses, spam and trojans.
iv) Cyber-bullying and cyber-stalking.
v) People unable to interact 'in person'.
vi) Online gambling.
positive: pcs help simply by saving time to do pretty much anything. equipment are created for making things less difficult right? to save lots of time. personal computers are tools. computers enable us to use the internet. you may focus on internet as well. no computers/no internet. and of course, internet also has several ways it assists society just like helping persons learn (people can read/research without having to spend time going to a library). that's a very broad question while there's plenty of reasons. opens a new way of transportation (paperwork). communication (friends/family/business). saves space (filing).
bad: safety. (info can easily be hacked, most important to get companies or agencies which have classified data such as the fbi/army etc . likewise, stalkers). improper content for children, society relies too much upon computers at times, so every time a computer fades, they can't whatever it takes. confusing for some of the older generation, and harder to get things done for them for instance a things can easily be done on a computer today. some people never learn computer systems. gosh, there's so many causes!