Fascinating. Note that vid has 6M views. She became famous by her do-nothing-look-cute videos. Here's a short bio quote from Wikipedia Magibon:
Magibon (born August 9, 1986) is an American Internet personality and YouTube celebrity on the video-sharing website YouTube. Magibon is also a member of the YouTube Partner Program.
For more dramatic info, see:
This vid has 3M views (not counting several mirrors).
Boxxy is another popular 4chan personality. She's listed in Wikipedia's List of YouTube personalities. Quote:
An anonymous teenage girl who became popular for her comedic YouTube videos. Fights between her supporters and her detractors caused unprecedented disruption in 4chan's "/b/" forum; this eventually lead to a controversial, all-out "war" between her supporters and her haters.
Her name is Catherine Wayne. Her website: http://catiewayne.com/
Thanks to meowcat for showing me links.