Even if this topic is old, I came upon the same need.
Regarding the answer of Jeff Atwood, I told myself that the functionnality could be useful, but the default display was really confusing.
I solved my confusion my playing with css styling.
If someone has the same reaction, this helped me to have a clear vision of what’s happening on the page :
suggested-topics {
border-top: solid;
border-color: #86a7db;
background-color: #dae3e8;
}
.topic-post {
border: solid;
border-color: #c8d5db;
background-color: #e6f0f5;
}