I set my user's profiles with Heartbeat. At first moment they just look fine but when I open the web to the private beta I realized that when users started to comment nodes, the heartbeat logs of their profiles began to show too much information, they started to look overcrowded. So I have been asking to implement an option to the module core to show the log comments collapsed by default but none has replied.
There is another thread (Display a comment link instead of all the textareas.) on Drupal forums referring to something similar but I don't know how to use that information because I'm a rookie in Drupal hooking & custom modules writing.
Hint: maybe using this code (default option when clicking on Heartbeat comment count)