So lots of folks are wary of anything owned by google so I'll just give a quick summary. In your dashboard of blogger.com you can find stats for your blog. This does not let you really spy on your users (good!) but it does basically tell if people are actually bothering to read what you write or not. It'll show you little graphs with that can show you that maybe a bunch of Android phones with Google Chrome read your post from last week on Friday, or that a couple Gnu-Linux computer users looked at one post you wrote from 2010 on Saturday. It's pretty useful for showing me if something actually gets read or not, without me being able to track individual users and the readers don't have to make an account.
And this is good, but you have to sign your soul over to the dreaded google monolith for it. Do any other blogging services have something like this?