Show activities on users' posted content I would like to provide a view, and something like a newsletter, where the users can see what actions (e.g. commented) are done on their posted content.

I thought I could do this with Activity, but I can only catch the events the users did on their posts.
Do have any idea on how to provide this?
There's a module called Heartbeat that should achieve what you're looking for.

Here is a quote about it (from the module's project page):


  ... displays user activity on a website. This module is an API to log activity. The logged data contains message structures, attributes and variables. Once the activity messages exist in the database, they will be parsed and build into activity streams.