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Telegram is a cloud-based instant messaging service that focusses on privacy and multi-platform availability. Telegram clients exist for both mobile (Android, iOS, Windows Phone, Ubuntu Touch) and desktop systems (Windows, OS X, Linux).〔(【引用サイトリンク】title=List of Telegram applications )〕〔(【引用サイトリンク】title=Che cosa è Telegram, Squer.it )〕 Users can send messages and exchange photos, videos, stickers and files of any type up to 1.5 GB in size. Telegram also provides optional end-to-end encrypted messaging with self-destruct timers. Telegram is supported by the Russian-born entrepreneur Pavel Durov,〔(【引用サイトリンク】Telegram FAQ )〕 who is now living in exile.〔 Its client-side code is open-source software, whereas its server-side code is closed-sourced and proprietary. The service also provides APIs to independent developers. == History == Telegram was launched in 2013 by brothers Nikolai and Pavel Durov, who previously founded the Russian social network VK, but had to leave the company after it was taken over by the Russian Government.〔〔(【引用サイトリンク】title=Meet Telegram, A Secure Messaging App From The Founders Of VK, Russia’s Largest Social Network )〕 Nikolai Durov created the MTProto protocol that is the basis for the messenger, while Pavel provided financial support and infrastructure through his Digital Fortress fund.〔(【引用サイトリンク】publisher=Reuters )〕 Telegram is registered as both an English LLP and an American LLC. It does not disclose where it rents offices or which legal entities it uses to rent them, citing the need to "shelter the team from unnecessary influence" and protect users from governmental data requests. The service says that it is headquartered in Berlin, Germany. Durov left Russia and is said to be moving from country to country with a small group of computer programmers. In October 2013, Telegram had 100,000 daily active users.〔 On 24 March 2014, Telegram announced that it has reached 35 million monthly users and 15 million daily active users. In October 2014, South Korean governmental surveillance plans drove many of its citizens to switch to Telegram.〔 In December 2014, Telegram announced they had 50 million active users, generating 1 billion daily messages and that they had 1 million new users signing up on their service every week; traffic doubled in five months with 2 billion daily messages. Later announcement stated the app delivers 12 billion daily messages. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Telegram (software)」の詳細全文を読む スポンサード リンク
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