A spammer can send you fake referrer traffic, fake organic traffic, fake direct traffic, fake traffic from social media etc. This sort of spam traffic will take a bad effect to rank your site and many others. There are many thing to write why they send you spam traffic? What's the benefit they are going to get by sending this sort of spam traffic? I just want to say you that this is very important to remove spam traffic. In this service I'm gonna help you to remove those spam traffic in Google Analytics. # I will block spam referrer through custom advanced filter in google analytics. Good luck