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but the important part about physical presence is hallway tracks, an opportunity to talk to other people in the field, make contacts, etc; talks themselves are just the core part to organize around
But you can also do all of those things online, as Discord has quite aptly demonstrated (doesn't have to be Discord, but that's a proven formula).
not really, a lot of people do not use social media/have no idea where/how to connect with similarly minded people/prefer irl contact/etc
An online conference can have an official place to chat, including a short guide for people not familiar with whatever technology is used. I've seen it done really well, with encouraging people to introduce themselves, taking questions and opt in random group chats in the breaks.
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