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. Telegram has over 700 million monthly active users and is one of the 10 most downloaded apps in the world.
Telegram groups are a powerful tool for building communities and can support up to 200,000 members each.
Link to Telegram Website: https://telegram.org/
Telegram - a new era of messaging
Since Telegram groups can have up to 200,000 members we support replies, mentions and hashtags that help maintain order and keep communication in large communities efficient. You can appoint admins with advanced tools to help these communities prosper in peace. Public groups can be joined by anyone and are powerful platforms for discussions and collecting feedback.
https://telegram.org/tour/groups