One person (their VP Product) was on paternity. You don't fire people like that unless they did something very very wrong.
Misrepresenting spam/bot accounts would fall under that bucket. If the number of spam accounts is like 20% (instead of 5%), not only would the deal fall through, other shareholders would sue twitter.
Not sure this misrepresentation would count as financial misrepresentation (which results in jail etc under Sarbanes-Oxley)
