Concerning Community Builder, YES, JMS is compatible as have mentionned in our product detail. We distribute a specific patch for this extensin (CB 1.2).
See also the testimonial of a customer that have published the extension he is using
www.jms2win.com/forum?func=view&id=486&catid=19
Concerninng JoomSocial, I don't.
Perhaps you will have a reply from a customer that use it.
In general, I am informed when an extension does not work and not when it works.
As I have not received any negative feedback for JoomSocial, I assume it works.