It's probably a bug with how we're checking if the modules are 'enabled'. It sounds like you actually do correctly have them installed but don't have any 'instances' of them created. If you go to the Module Manager, hit "new" and create a new instance of the Like, Fan, or any of the other modules you mentioned, I think it will probably display as Published on the Overview page.
Hope that helps, but if still confused, just let me know.
Thanks,
Alex