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a person (typically a commoner) that becomes famous via the internet usually through a video sharing site like youtube.com or a social network like mysp-ce.com.
the star wars kid became an interlebrity after the spread of his sad, yet comical video.
an internet celebrity.
aka
a single person or a group who, via internet (most commonly through youtube), through the production of entertainment, have single handedly gained celebrity status or a large following/fan base.

these range from vloggers, to musicians, to actors, to artists, to comedians, to movie editors, film students, to kids in their bas-m-nt, to singers, to dancers, to puppeteers, to authors, to news broadcasters, etcetc the list goes on and on and is perpetually growing larger and larger as people p-ss their favorites around and new talent rises in the eyes of the viewers.
several examples of an interlebrity:

sxephil
http://www.youtube.com/user/sxephil

neilcicierega
http://www.youtube.com/watch?v=tx1xim6q4r4

julia nunes
http://www.youtube.com/user/jaaaaaaa?ob=4

what the buck
http://www.youtube.com/user/whatthebuckshow?ob=1

kris-wilson
http://kris-wilson.deviantart.com/

smosh
http://www.youtube.com/user/smosh?ob=1

nerimon
http://www.youtube.com/user/nerimon?ob=1

charlieissocoollike
http://www.youtube.com/user/charlieissocoollike?ob=1

brandon hardesty
http://www.youtube.com/user/artietsmitw

vlogbrothers
http://www.youtube.com/user/vlogbrothers?ob=4

chris crocker
http://www.youtube.com/user/itschriscrocker?ob=1

evil iguana productions
http://www.youtube.com/watch?v=8sybqhoedrq

fiveawesomegirls
http://www.youtube.com/user/fiveawesomegirls?ob=4

fiveawesomeguys
http://www.youtube.com/user/fiveawesomeguys?ob=4

and many many many many many many more.