Facebook is still the largest supplier of traffic. A new report from the U.S. shows that all other social networks can not come close to Facebook in the fourth quarter of 2013. Surprisingly, only the performance of Pinterest, because the "Social Network for images" can be increased slightly and claim second place. All other candidates, including Twitter and Google+ seem rather among the "also rans" and really do not care for that one then has significant advantages with referral traffic if you talk a website. But what precise conclusions can be drawn from the current development?