It wasn't the tweet that caused the sell off, it was the poor Q1 numbers.
Well sort-of. The thing is wall street speculation is now highly automated. If a stock starts to slip before the numbers are supposed to be released, all the algorithms start to throw off warning bells and cause a sell-off run much more efficiently than humans reading twitter ever could.
If stock slips during an earnings announcement, it is expected, and bots don't emulate panic... if it happens BEFORE earnings announcements, bots latch on to the pattern in what is essentially insider trading, but with plausible deniability.
Understanding is always the understanding of a smaller problem in relation to a bigger problem. -- P.D. Ouspensky