The recent bad news that hit FB has caused the price to fall by more than 10% last week. OUCH.
Note that the important resistance level at 223.67 that has been taken out on 20 May 20 and turn support has now been breached. Here, if the price does fall through the bullish trend line, then we can see it heading towards first 216 then 174.
If you want to short, be patient, wait for the pullback to 223.67 , assess the situation before initiating your shorts. There lies a possibility of a price rebound as the price is still within the bullish trend line.