Have noticed on a couple of sites that the list of links gets hijacked in part. Had a quick look inside the plugin to see if it has been compromised but nothing obvious.
What happens is that the most popular posts on the site display an external link when you hover over. This is a reverse Seo kind of thing that happens in the pharma hack.
Somewhere there is a look up table that takes selected top posts / aliases them to an look up table ( but where) and displays those. Has happened on 2 sites now - one is running 2010 them and the other a woo theme. A succuri scan shows nothing and looking at the plugin code also nothing. Because this plugin looks back at jet pack stats that is another linkage but assuming there is nothing bad there. Potentially though because there is a stats table and a link back to this plugin - there might be a extra hijack table being inserted somewhere.