When in SPARK and in "People" view, what does it mean when there is a green circle around the persons picture?

There are times when I post to SPARK and may need to redo the POST. When I do this, there is always a SPARK history.  Can this history be removed or turned off?In other words, there is a light gray history of every action made in the SPARK room...It ...

We're looking to provide information to team members in SPARK. Wondering why we are not able to provide a description other than the word "General" at the top of the screen:?