Can't stop random safari pop-up/wordpress widget
I am using a 2009 iMac running Mavericks. This problem happens several times daily. If I'm using Safari, a tab pops up and a web page is displayed, all blank white except for the message "no hotlinking please." If I'm not using Safari, Safari opens up and displays this. I don't even know what it means! The title in the tab says "wordpress.com widget"
I was unable to post the screenshot due to content, but I found one someone else posted to Yahoo Answers here.
Why is this happening? How do I stop this from happening?
iMac, Mac OS X (10.6.8)