The internet is extremely useful for research and question asking (This exact website, for example) It can also be used to relieve stress by playing or chatting online, and less stress usually means it's easier to focus.
The internet is useful in health, academic research, transport, sports, business and in entertainment.
how to manage internet access in academic environment
The most useful site in the internet is google.com.
There are entire journals devoted to internet marketing such as the Internet Marketing Journal and the International Journal of Online Marketing. If you are looking for a more business focused approach, rather than an academic one, there are magazines such as Fast Company that can be useful.
what is research
Reliable sources such as government websites, academic databases, and well-established organizations are the most useful places to look for accurate information on the internet. It's important to verify the credibility of the source before relying on the information found online.
The internet is very useful and anyone who is reading this answer is on the internet right now!
The internet can be useful and harmful.
The purpose of mining is to find and retrieve useful materials in the ground and bedrock.
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No, it serves no useful purpose.
Otiose is a single word synonym for serving no useful purpose.