I want to set up a server for small group meetings. I'm looking for features like audio conferencing, multi-point video, screen sharing... stuff like that. I'm familiar/comfortable administering Ubuntu servers, so for this task I'd likely fire up a small EC2 server running Ubuntu. I'm most interested in using FLOSS. I see there are at least a couple of options out there. For example: bigbluebutton and openmeetings. Anyone installed either (or a different one) and have recommendations/tips? If yes, have you ever upgraded same?

I notice bigbluebutton has deb packages, so that might be pretty straightforward. openmeetings appears to support logging in with a facebook account; that might be a good way to avoid having to manage logins.