You can subscribe to a thread. Each time someone posts on that thread, you'll be sent an email. You can do that by using the THREAD TOOL options at the top of the thread (that you wish to subscribe to).
You can't follow someone per se. You may add them to your BUDDY LIST. This allows you to quickly access their profile.
You may then, choose to click on their STATISTICS tab.
That'll allow you to:
- Find all of the posts by that user.
- Find all threads started by that user.