If you are currently looking for your blog's ID, you are probably on your way in designing your blog template, or maybe trying out a follow button tutorial out there. Once you knew how to find you blog ID, you don't have to read this entry again because your blog ID is located just around you, it's just that you never realize it all these while.
Where is it?
It was there, when you are updating your blog, or designing your blog. It was always there. And is still there.
