Okay, so I've worked out there is a way to count this. Go to Forums>Members and sort by last login. Then count the members logged in within the last week/month.

A little intensive if you have loads of users.

Would just be nice to have the statistic appear on the dashboard.

I'd recommend this plugin Activity Log plugin:

https://wordpress.org/plugins/aryo-activity-log/

It logs last login users but it doesn't include wpForo topic/posts yet. You can suggest them add wpForo actions like:

• add new topic
• add new post
• like/dislike
• edit/sticky/close/move/approve/unapprove...
• edit profile