I discovered that there is no global setting where you can choose to follow a post or not. All posts are automatically followed. You have to manually un-follow each post Thanks a lot.  
Dell Community automatically makes me follow posts. I don't like this - if I want to follow a post, I'll make that decision.  I don't see a place where I can stop following a post. How do I do that?
How Can I Stop Automatically Following a Post