Gloria Huang, a Red Cross social media specialist is responsible for this tweet and claims it was the result of not being familiar with HootSuite, a brand management service that will assist you with social media.
While confusion could be to blame, it sounds more like to me that Gloria was just too excited to "#gettnslizzerd" after work to focus on which twitter account she was suppose to be updating.
Luckily for her the situation was not a Twitastrophe. Her excited tweet was joked about in later tweets and the whole thing blew over fairly quickly. But for at least one hour the whole world wanted to party with the Red Cross.
