Everyone puts tags on their posts. The wordpress provides the page dedicated just to Tags. If you want to find out what people are talking about on a certain subject you can go to that page.
You may wish that information directly to come to you.
If you want to see all the posts people are making about – for example – rabbits, go to your Tag Surfer page and enter that tag. Now every time you login you can check all the recent posts which are tagged ‘rabbits’.
If you do not want to follow a tag any more, click the X and the tag and all it’s posts will be removed.