There seems to be an infinite number of self-destructing apps that promises secure messaging, but Telegram is adding another benefit to its free service - it’s a nonprofit company with an open source model. There are no ads and will never be, plus, anyone can download the sourcecode and read how Telegram works – it’s all available on Github.
The company is from Russia, but it’s not operating comepltely in Russia: Telegram’s servers are spread all over the world and doesn’t even keep encrypted data of any messages labeled secret. Unlike other encrypted email services like Gmail – based on MTProto, Telegram’s encryption originates from the sender’s phone, cannot be forwarded, and can be set to self-destruct on all devices. Read more