That's a pretty big drop in price, but if you look at Facebook's 10-year price chart it really doesn't seem so bad--especially since the stock will probably recover in no time:
I'm not even sure why single day performance of any stock is newsworthy or why in a market like today's where pretty much every stock is overvalued everyone is looking for explanations. Honestly, I'd say the S&P and NASDAQ are both due for a 26% one-day drop. This has been the longest bull market in stocks
ever if I'm not mistaken. I remember when it started, too, right after that massive crash and subsequent recovery in 2009. I'm sure there are a lot of younger members here who weren't old enough to care about something like that, so that's one hell of a sustained bull market!
But these kinds of markets never last forever, not in stocks, not in crypto, not in any market. And with a company like Facebook, which hasn't been around as long as other companies with massive market caps, volatility like what we saw on Thursday is kind of to be expected.