There is no "Social" module, only a plugin. It's in the download area for JFBConnect, and is named:
plg_system_jfbcsocial_j1.5_v3.0.2.tar.gz
You can insert the {} tags (JFBCLike, JFBCComments, JFBCFan, etc) manually into an article or your template, or use the modules to configure and insert them automatically.
We realize there's a lot of downloads, and are looking into creating a larger 1-zip download. That has it's own issues though for users that don't want to install all the combinations of modules.
As for module versioning, we only increase the last digit (revision version, ex 3.0.x) when a new release of that specific item is released-- usually for a bug-fix or minor feature improvement. We do not re-release all packages for a revision release of any of the packages. For a minor release (3.x.0), we do re-release all packages to ensure compatibility and that all users upgrade correctly.
Hope this helps clear things up. If you have any suggestions or feedback to improve our system, let us know!