If you are a Facebook user and would like - join our 90 Minds Group. It's limited to 90 Minds members. It does not replace Socialcast but is a place for those of us who are in Facebook throughout the day to share news and comments about news items.
Facebook also have pretty good group chat and I'm thinking that's what we'll use for chat during Summit in Vegas.
https://www.facebook.com/groups/90minds/