I started doing Zwift (the cycling trainer thing) a few weeks back. I did a real-time / virtual group ride two weeks back (set up to benefit ALS by André Greipel for those who know cycling} with 6,000+ people - I think it was the largest Zwift event ever. In the app there's all sorts of messaging, and the moderator came on and said they got a message from a small group of riders who were in their homes on their trainers in quarantine in China, and wanted to say how much they appreciated the ability to join any "event" with other live people.
In the app you have the ability to chat and "ride with" other people (based on your power output, you can draft etc.), and soon there was a huge group virtually riding and chatting with the quarantined bunch. Pretty cool if you ask me.