The spread of the Internet has led to an increase in the proportion of individuals using social media. However, the fact that social media facilitates the transmission and spread not only of reliable information but also of rumors and hoaxes sometimes hinders rescue and recovery efforts during disasters and other emergencies. Elucidating how people behave with respect to information spread via social media may be important for building a reliable information distribution system. This paper reports the findings of an online questionnaire survey on media trust and the relationship between trust and behaviors such as information forwarding. The results indicate that the degree to which information is perceived to be reliable differs according to age and gender, and that some people share and forward information even when they themselves do not trust it.