Discord

• An app used by many crypto projects to communicate with their community.
• As FlatOutCrypto put it (23-10-2019):

"Slack and Discord are used for tech talk, rather than price/general discussion of Telegram.

As a result they are usually barren wastelands, barring community led projects which can still feature good technical discussion."

• Other channels that are often used are Telegram, Twitter and Reddit.