What can you do with Telegram?

ABOUT
https://telegram.org/faq

BLOG
https://telegram.org/blog

APPS
https://telegram.org/apps

PLATFORM
https://core.telegram.org/

TWITTER
https://twitter.com/telegram

FAQ
Telegram FAQ

This FAQ provides answers to basic questions about Telegram.
Check out our Advanced FAQ for more technical information
https://core.telegram.org/techfaq

General
https://telegram.org/faq#q-what-is-telegram-what-do-i-do-here
https://telegram.org/faq#q-what-is-telegram-what-do-i-do-here

What is Telegram?
Who is it for?
How is it different from WhatsApp?
How old is Telegram?
Is it available on my device?
Who are the people behind Telegram?
Where is Telegram based?
How do you make money?
What are your thoughts on internet privacy?
Do you process takedown requests?
Do you process data requests?

Telegram Basics
https://telegram.org/faq#q-who-can-i-write-to

Who can I message?
Who has Telegram?
Inviting friendsWhat do the green checks mean in Telegram?
Can I hide my ‘last seen’?
Who can see me ‘online’?
Voice callsUsing emoticons on iOS

Groups, Supergroups, and Channels
https://telegram.org/faq#q-what-makes-telegram-groups-cool

What makes Telegram groups cool?
How are they all different?
Creating a groupAdding members and using Invite Links

Usernames and t.me
https://telegram.org/faq#q-what-are-usernames-how-do-i-get-one

What are usernames?
How do I get one?
How does t.me work?
What can I use as my username?
Do I need a username?
Will people know my number?
How do I delete my username?
What do I do if my username is taken?