This tag should be used to differentiate questions about the chat service with an open API from other questions. Use when the topic is the secure, cross-platform cloud-based instant messenger service Telegram. Do not use in the sense of a message sent by telegraph for delivery in written or printed form.
From Telegram F.A.Q.:
Q: What is Telegram? What do I do here?
Telegram is a messaging app with a focus on speed and security, it’s super-fast, simple and free. You can use Telegram on all your devices at the same time — your messages sync seamlessly across any number of your phones, tablets or computers.
With Telegram, you can send messages, photos, videos and files of any type (doc, zip, mp3, etc), as well as create groups for up to 100,000 people or channels for broadcasting to unlimited audiences. You can write to your phone contacts and find people by their usernames. As a result, Telegram is like SMS and email combined — and can take care of all your personal or business messaging needs. In addition to this, we support end-to-end encrypted voice calls.