@matrix I just now found out that a mobile app was NOT required to attend #FOSDEM, and also that the event is apparently over. When I clicked on the chat link a few days ago, I was scared away by the huge: "get the app" message and missed the link at the bottom as a result.
Was this talk recorded? Looking into Matrix is on my TODO list and now I know there is some integration with Jitsi. I'm still not sure what Matrix is, but it seems like more than merely "a chat system"!
mastodon.matrix.org is one server in the network