Pay more attention to the parallel structure, if you want to establish the noun with the article, then you need to put an article before the word 'environmentalist' - 'an environmentalist', - 'a philantropist' ...
next is - I'm - not - i'm -
capital I is very important
next is - a guy who is running the page @madcultures.
or - a guy who runs @madcultures - this will do
use present continuous (is running) if it's a temporary job.
use present simple (runs) if it's for all the time.
next is - man who is exploring -
next is - various media that range
the word various media in itself considered as plural noun
so it should use plural verb 'range' instead of singular verb 'ranges'
after just like you put a period.