You can write to your phone contacts and find people by their usernames. With Telegram for macOS, you can send messages, photos, videos and files of any type (doc, zip, mp3, etc), as well as create groups for up to 1000 people or channels for broadcasting to unlimited audiences.
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.
Telegram for Mac is a messaging app with a focus on speed and security, it’s super-fast, simple and free.