When I clicked on my reading list yesterday to read new blog posts from those I follow, there were loads of posts from a blog I am not following. Turns out it is spam (in a way). If this happens anytime to you, and you want rid, here is what to do.
Select reading list. Click on each of your blogs and when you recognise the spam blog, go to your little edit pen top right of list (RHS of your screen) it says manage blogs. Now find the same blog that you were on and click the dustbin to get rid of it.
In this case, Mortgage Free in Three is the blog that has been hacked/had its address taken. I was a follower and that was where this spam blog was originating from. Gone now thank goodness.
I cannot reiterate strongly enough to download your blog every few weeks at the very least. If this happens to you, you at least can put your blog back on somewhere else rather than lose it forever.
Go to settings, click other. Top right of main page click "back up content", then when the next screen come up, click save to your computer. On my computer I get another screen that asks me to either open or save file. I click save file. A file with the extension .xml arrives in my download folder.