Joel,
When you visit a county page, the latest comment is at the top of the "Comment Wall" section. Right below where you enter a comment, you can click a link that says "Follow - email me when people comment". That will ensure you are emailed when someone comments. If you ever comment in a group, you will automatically be signed up to receive notices and will need to click "Stop Following - don't email me when people comment" if you don't want to receive notices.
For discussions within a group, it is very similar. If you ever respond, you will automatically begin receiving updates on the conversation. If you haven't responded and would like to follow the conversation, scroll to the bottom left of any page of the discussion and click "Follow - email me when people reply".
Have a nice day,
Joel said:
How do I go directly to a last activity on county group.
Thanks,
Joel