Is Twitter buried in the various index mutual funds? If so, it will have a bottom not as bad as an individually sold stock.
Yes they are in mutual funds, but you can look to see if your fund owns TWTR then make a different selection.
Yes, Twitter joined the S&P 500 in 2018, so it’s a indeed a component of the biggest index funds. Of course, that may not provide as much a floor as you might think. I know this from experience. Such big wheels as Boeing, Exxon and G.E. have shown it’s possible to shed, 50, 60, 80 percent relatively quickly if things start going south for the company.
Index funds have very low expenses and are great while the market is going up - would expect that they would not do so well when things turn sideways or down.