You can subscribe to specific Terms, Authors and threads on the site. You will need to be logged in in order to subscribe. Here is the process:
1. Log in to your account
2. Click on Edit on the top page
3. Click on Notifications
4. Add Subscription
5. On this page, you can subscribe to Tags (terms), Authors and Threads
6. Create Tags.
Here, you can add any terms you would like to subscribe to. If there is any activity on the site for that particular term, you will get a notification in your email ID. You can choose the frequency of the duration too.