So “active” but not engaged = “lurking”?
I guess engaging could be stuff like changing Preference settings and tracking levels. But to me that’s more like being involved with the forum than engagement with the community.
Starting a topic and posting a reply are ways to engage as are messaging.
@ mentions happen within posts. Then there are Likes, Shares, and Flags. I think Likes and Flags count as engaging, but I’m not sure if sharing is more like promoting.