I understand that this was not just a twitter tantrum, but a major disruption of business: inability to book online in China, in fact causing huge losses.
>It should have been the guy that allowed all low level employees access to the official Marriott twitter account
Where in the article did it say that all low-level employees have access to the official Twitter account?
The employee in question had access because it was literally his job to reply to customers on their official Twitter account:
The Marriott customer care manager intended to spend his eight-hour overnight shift doing what he always did: helping hundreds of Marriott customers around the world as they shot complaints, questions and reward-point requests to the hotel chain’s official Twitter accounts
Surely they are using some overlay tool (tweetdeck, etc) instead of direct Twitter access. The tool should have limited or used some approval process for "likes" if that was viewed as risky.