Both should be taken with a substantial grain of salt. The first only measures visitors to my actual blog page - there isn't any way I know of knowing who my subscribers via RSS. The second is everyone in my Reader as it stands right now. It hasn't been cleaned out in ages and there are quite a few people that haven't posted in a long, long while.
What does this tell me? Well, I show my monolingual tendencies by sticking to English only blogs. It's not that I don't want to broaden my scope but am unsure of where to look to get away from over populating my Reader with a few dominant countries. Still, I wonder what other people's graphs might look like. Is this a reasonable way to gain a global picture of education and learning? Would my Twitter graph look different?