Following criticism of the South Korean government's response to the Sewol Ferry Disaster, Korean authorities announced a "zero-tolerance policy" which involved investigation and detention of individuals deemed to be spreading libel through Internet media. [25] Some KakaoTalk users have received notices that their messaging accounts were searched by South Korean authorities. Apprehension about government surveillance has driven many KakaoTalk users to other messaging services such as Telegram which they believe to be more secure.[26]