Paul,
Right now, we don't have any special integration for EasyDiscuss. We're planning a few features to implement for it later this year though.
For EasyBlog, we don't currently insert social buttons into blog posts as they already insert their own buttons. We do have an Open Graph plugin for EasyBlog which will help you set and control the Open Graph tags for your blogs and posts. You can also create Open Graph 'actions' for posting activity to a user's Timeline when the comment, vote or read a blog post.
Regarding JomSocial, we have excellent support for it, including profile import from Facebook, Google (and soon Twitter) as well as Open Graph tags and action support and other features.
I hope that helps answer your question, but if there's anything else you're looking for, just let me know.
Thanks,
Alex