Twitter was used to a great extent by government, media and individuals to obtain and exchange information real time during emergency. In ambiguous situation where information is crucial, some misinformation may creep in and spread around by retweet. This paper discusses on Twitter issues in emergency situation. A survey was conducted to investigate user’s decision making after one read retweet messages in Twitter. As the result of the factor analyses, we grouped the 28 question items into three categories: 1) Desire to spread the retweet messages as it is considered important, 2) Mark the retweet messages as favorite using Twitter “Favorite” function, and 3) Search for further information about the content of the retweet messages.