I suffered some spam traffic(darodar.com/ilovevitaly.com/priceg.com) on my website these days. I searched a tutorial and set the filtration in GA. But I have some doubts about this. A. Why they choose my website? B. What’s their purpose? C. Will there be any bad affect to my site search or anything else when I filtrate these spam site? Thanks
I think you are talking about referrer spam and it is incredibly annoying. (I also get darodar.com and also semalt.com regularly). I'm not exactly sure of how they manage to find your site or how they end up as your top referrer, but there is a link below to an article that shows you how to block Darodar. http://www.sudorank.com/guide-how-to-block-darodar-referral-spam-to-your-website/