(Credit: CC flikr/Flickr)Yes, researchers at Ohio State University have delved deep into the habit that is Facebook and concluded that those who express their membership regularly do worse in school tests.
In fact, they say, the majority of those who Facebook daily do worse by as much as one whole grade. More at; http://news.cnet.com/8301-17852_3-10217704-71.html?tag=newsBlogPromoArea.2