IBM Connections 4 expose a way to get the comments of a Status Update entry. Here's one easy way to do it with an asynchronous HTTP (Ajax) request using jQuery.
There is not a link to IBM Connections 4 documentation.
Atom API Request Details
|Content-Type : application/json; charset=UTF-8|
|Response||Status Code: 200 OK|
Example using jQuery
Note: console.log can throw errors in IE, they are there for illustrative purposes only and should be changed as required.