Acting quickly on news is a risk that they hope will pay a reward, but there is no guarantee that the news is correct and thus the risky position will be rewarded.

If you wait for verified, accurate news, then anyone who moved before got to move before you. Thus, participants in that market move when they want to accept the risk they want.

It doesn't matter if you verify Twitter with the best security around because markets will and always have reacted to rumor and unverified speculation and news. It's a gamble that the participants willingly make.