Telegram, which has been around since 2013, doesn't have end-to-end encryption on by default. There are two types of encryption in Telegram, one for private and group chats and one for "Secret Chats" which adds another layer of encryption (that has to be enabled). But Telegram has had multiple controversies over the years, including a colossal revenge porn problem and a case of human rights violation.
Music: Dale North and Terrence O’Brien
德国华裔导演杜耀豪历时四年半制作了纪录片《你豪吗》（Hao Are You），探寻母亲支离破碎的家族历史。（受访者供图），更多细节参见爱思助手下载最新版本
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