user
person who uses a computer or network service
gamer
person who plays video games and/or identifies with the gamer identity
heavy user
group of users
uploader
someone who uploads video, audio, or other resources online
end-user
person who ultimately uses or is intended to ultimately use a product; stands in contrast to users who support or maintain the product
lamer
slang term
Internet forum moderator
forum position
power user
computer user who uses more advanced features of computer hardware, operating systems, programs, or web sites than the average user