Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Server Fault - Server Fault is a Q&A site for system administrators and IT professionals that's free.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Sapien - Sapien is a Web3 social network that gives users control of their data, rewards content creators, and fights fake news.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Poal.co - A free speech based link and comment aggregation platform.