Facebook is a stock with strong fundamentals and zero debt. Irrespective of some bad news recently, the stock still rallies in the upward trend. I have seen the weekly chart which shows since 2013 the stock is on the upward trend and moving above the 100 EMA consistently. The chart respects the strong support pink line and on july 2017 it broke the green resistance line. During nov 2016 it retraced to 38.2% and in march 2018 it retraced 50%. In these cases, it respected the strong support line.
1] The retracement may take a support at the green line and bounce back from the 180 level. 2] Incase, it breaks the green line and falls down it could respect the strong support of pink line and then bounce back. 3] IF it breaks the pink line of support then big reversal could take place. Mark 160-155 final stop loss.
MACD is positive above the zero line and bullish crossover is maintained.
The fall can't be predicted. Overall, it's a long trend and with good opportunity to buy shares at a discounted price. Good time to buy when bounces back from green line or pink line.