Ok, maybe not tons of security issues, but maybe some pitfalls. My imagined use-case is where your friend on a different server posts an event, it gets put int

Ok, maybe not tons of security issues, but maybe some pitfalls. My imagined use-case is where your friend on a different server posts an event, it gets put into your feed, and when you view your feed you're able to see an updated list of people attending by directly querying the friend's server. Would be pretty slick.