There is quite a lot of forum extensions for Joomla
Can anyone recommend a free one that doesn't have all the facebook / twitter / avatar stuff on it
Must be linked to the joomla login though if possible so staff only have to log into the intranet once.
I use Kunena on my sites. Free and the support is really good. It is really configurable in the backend so I am sure you could remove anything you didn't want.
Any reason for having no avatars though? That is a key feature usually for forums.
Yep, I would also suggest Kunena...