Internet user - 网民? 互联网用户? The question is simple – do these two terms mean the same thing? I have seen the first one translated as a "netizen" once, but do they principally mean the same thing? Thanks in advance!
We usually use the term 网民 to describe  "people who use the internet frequently".  The literal translation of 网民 is " web resident"

互联网用户 just means "internet user". If you have access to the internet, even if you check your email once a week, you are still an internet user.