What could cause posts from social media sites to auto publish to blog?

I have been toying with numerous auto-posters, both in WordPress as plugins, including JetPack’s Publicize and Nextscripts’ SNAP (Social Networks Auto Poster) plugin, as well as out of WordPress, namely, Friends+Me.

I suddenly had the problem of any posts that I would originate in social media (namely Google+) to be shared over and over and over again to all my social media sites I use, including FB, Twitter, etc., which I later figured was because my Friends+Me was set to repeat posts by default every 10 minutes. So, I discovered that and fixed it…

BUT, what I cannot figure out is why my post from what I assume is Google+ (but could be from FB) was somehow being auto-posted to my WordPress blog? It usually takes an API or some other username/password permission thing for an auto-poster to be able to post to other sites, and my Friends+Me doesn’t have an option to post to WordPress, so…

My question is WHAT can cause a post that originated in a social media site not at all connected in any way to my WordPress blog, to automatically post to my WordPress blog? Could it be Jetpack’s Publicize or Nextscripts’ SNAP? I checked out the settings to both out carefully and nothing leads me to believe that they were the culprits. So, if not those plugins, and not Friends+Me, then, what could cause that to happen? The reason I ask is because I need to shut it off!

Thanks for any help I could receive on this from anyone who has a clue. My site is makeafortunewithfashion.com but, you won’t be able to see anything out of the ordinary when looking at the site. I have already deleted all 1,500+ repeats of these auto-posted posts on my blog.