Activity Stream Needs Participation Indication

[Ocean West]

There is no "star" or other visual indicator that I had participated, an item by looking at the stream

Perhaps a double circle around the content type circle?

   or 

 

[BomAleold]

related to partecipation when i see "unreaded stream" much post related to a topic is little confusing, it could be merged into a content parent node(topic file article... not see comments replies reviews) and show a counter for unreaded content for any "macro" content item.