Snapchat already has a 'sell' rating, and the analyst thinks it will crash 58% (SNAP)

Shares of Snap Inc. got slapped with a "sell" rating as they made their trading debut. 
The parent company of Snapchat opened up at $24, up 41% from the initial public offering price of $17 per share. It was a solid start for the first social-media IPO since Twitter went public.
But Brian Wieser, an analyst at Pivotal Research Group, placed a price target of $10 on the stock, or 58% lower than its opening price. 
"Investors in Snap will be exposed to an upstart facing aggress