Kim Kardashian didn't invent selfies, but she did take it from something only poor people whose cameras don't have timers did to a full-blown "fad". That makes it the most grevious IMO.
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Top 10 Worst Fads We Can Blame on Celebrities
#2
Suggested by
drewbrown
2010s - Shutter Shades - Kanye West
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#3
Suggested by
drewbrown
1980s - Leg Warmers and off the shoulder shirts - Jennifer Beals (Flashdance)