For secure communication, Signal works, but requires a phone number. Matrix (https://matrix.org/) is great and allows file sharing and voice/video chat. You can run your own server or use someone else who hosts one, like the official matrix.org server. It is end-to-end encrypted. Use Jitsi or Jami for video conferencing.
Mastodon is the best Twitter/microblog alternative, being federated and FOSS.
Peertube is a FOSS and federated Youtube replacement.
For these platforms that are federated and/or decentralized, they cannot be shut down.
For secure communication, Signal works, but requires a phone number. Matrix (https://matrix.org/) is great and allows file sharing and voice/video chat. You can run your own server or use someone else who hosts one, like the official matrix.org server. It is end-to-end encrypted. Use Jitsi or Jami for video conferencing.
Mastodon is the best Twitter/microblog alternative, being federated and FOSS.
Peertube is a FOSS and federated Youtube replacement.
For these platforms that are federated and/or decentralized, they cannot be shut down.