If you have a blog and noticed that your getting a whole lot of traffic from Vampire Stat or some other site with a similar name then beware.
Do not click the site name to figure out what it is. It is bogus and you could end up with Malware on your computer. All this does is send out bots to different blogs in order to get visits so they can infect your machine with ads.
Just ignore them, they do not have any effect on your Adsense standings.
Hope this helps others.