Well the answer to that is that I don’t really know. I mean, how do you tell?
I received a notification that a ‘blogger’ had liked a post and was now following me. Of course I was interested to know who they were and to have a look at some of their posts. On opening their site I was surprised to see that the only post was the standard start-up “This is your first post” entry and that the about page was the the start-up page also. It was also worrying that the name consisted of word with what looked like random numbers after it. It didn’t help that his/her chosen avatar looked like someone from the Assassin Creed books.
It might just be that they are new to WP, but (as good as I believe they are) I think it slightly unlikely that my posts would be the first that a ‘newbie’ would find. I did consider reporting the site as being a spam site, but there was no proof, there was no anything really. So I did the only thing I could think of and that was to remove them as a follower. As I understand, they can follow me again, and maybe that time it could be different.