1) I created a chatroom, how can i invite others in that chatroom? Is it possible to connect to IRC/slack/telegram/matrix chatrooms, how?
2) How to send/receive messages from mastodon/diaspora users? How to find them?
3) How to use nextcloud services from this hub?
4) are there any public chatrooms available in federation/fediverse/diaspora/hubzilla/mastodon?