I like forums for social groups, but if you do it with regular forums you will totally blow up forums cache (datastore).

On (semi-)large forums this will be disastrous (even with the limitations) on performance.

In the past there was already a hack that created blogs by creating a forum for members as a blog, with the same results (ok, the blog thing will be worse than this, but still)

Here is the promised Beta. Install the beta on your own risk or wait until tomorrow when the final 1.2 has been released.

Upgrade from 1.1:
1. Import the product, overwrite existing
2. Check settings, especially for parent forum

Changelog 1.2:
- Added: Groupleader can now be moderator of group forum
- Added: Minimum Members that are required for own forum
- Added: Group messaging will be automatically hide for group that has own forum
- Added: Forums are created with more allowances
- Added: By deleting a forum the linked socialgroup get's updated
- Added: Forum's description contains link back to social group
- Added: By changing group's name it synchronize it with the forum's name

There are more than two members in the group :)

Did you already created a forum? Do you have a link to that forum?

Yep sure, http://community.thinkteen.co.uk is the forum, the forum number is 61 :)

Please PM me a temporary user that has admin and query permissions so I can take a look for you.

How will this mod effect current groups?

It will not affect existing one - the social forums is a feature that CAN be added by clicking the link "Create Forum". This link is available for all groups with at least 2 members (Can be changed in SocialForums 1.2)

Will the privacy issue be taken care of in version 1.2? I have a lot of private groups and won't want members accessing the groups they don't belong to.

Which issue do you mean exactly? This mod does not change permissions for groups.