Blog collections are just a way to organize your blog posts for easier visibility. The best way to see how it works is on our own corporate blog: https://hey.crowdstack.com/blog. The links across the top of the images (Crowdstack, Community Management, Technology...) are Blog Collections.
You can also use blog collections as a permission level, so for example if you wanted only certain members to have access to a certain set of blogs, you can do that.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .