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JCPenny and Nina Garcia

Fashion critic Nina Garcia sent JC Penney shares up last July when she posted the following message on her Twitter account:

"I'm @jcpenney's HQ. Thank you Ron Johson [sic] for the walk through of JCP's prototype. Get ready to shop! Its [sic] going to be a game changer!" @ninagarcia )

Even though Garcia had been named JC Penney's "style voice" a month before her tweet, the stock still popped 8 percent.

(Read More: Tweets Moving Stocks)

CNBC/Twitter