I never really looked at Blogger's social network features before, but when I noticed that I had 53 followers without even trying, I figured I might as well see what I can do.
So far I added a "Followers" widget on the bottom of the left sidebar so you can see who is following this blog, and I just added a blog-wide comment tool on the top bar of the blog so you can have general comment conversations that don't necessarily have to be related with the posts.
Not sure if I really want to maintain two different comment systems but let's try it for now and see how people like it. For now, the topbar comments require you to be a member of the blog. You can also upload YouTube videos there, just as you can in the regular comment system.
Give it a shot and we'll see how it goes.