I just posted a message in Hillrunner.com News about the new feature available on the Hillrunner.com Forums to recommend a topic through any of several popular social bookmarking websites. Just check near the top right corner of any topic and you will see the icons available.
I just wanted to post a message here to ask if I missed any. Do you use a social bookmarking website that you don't see listed? If so, please let me know and I'll see what I can do to add it to the list. Then, you can easily bookmark any topic on the forums.