Configuration option "Social Discovery"

The below page describes the Social Discovery setting:
developers.facebook.com/docs/guides/canvas/

Facebook shares stories with friends when a user starts using a new app or first installs a new game. These installation discovery stories show up in friends' News Feed and enables users to discovery popular apps their friends are using.

There's more there, but disabling that setting will prevent any "John just started using" posts.

Additionally, make sure that you don't have anything set in the Configuration -> FB Wall Posts area for automatically posting when the user registers or logs into your site.

Beyond that, all actions would be taken on a users behalf, so they'd be the ones to intentionally be posting to their wall (Commenting, Like'ing, etc).

I hope that helps explain, but if not, let us know.

Thanks,
Alex

Dave,
No problem. If you need anything else, you know where to find us.

Finally, if you haven't already, please consider leaving a rating and review for JFBConnect, or our support, on the Joomla Extension Directory. It certainly isn't required, but is very appreciated:
extensions.joomla.org/extensions/social-...ook-integration/7215

Thanks, and good luck,
Alex