Hi, first of all sorry for my english. I see that google drops my sites in serp after i add backlink(s) to my sites. Why it happens all the time? I am doing seo since 2007 and google still works the same way. For example i have a site 1 year old, it has 35 root domains linked to this site. And when i get 1 new backlink from some site then i see drops in serp and drop in traffic for about 3-4 days, then my traffic and positions goes back to top and gives me more traffic than before getting that link. Then again, i get one more link from new domain and then i see drop again. I noticed that this link is from high pagerank site (or citiation flow) then my drop will be longer and deeper, 1 week at least. 2nd example, i have 2 sites that 5k daily traffic from google, then i put sitewide links(in header) to these 2 sites from my 3rd site, and now traffic on my 2 sites drops almost to zero, now it has 100unique hits a day, i put links 1 week ago but still dont see my traffic back. These 2 sites 1 year old too, but it has only around 20 root domains linked to these sites. So thats why i see so huge drop in my traffic. It seems to me that it doesnt matter how old your site are. If you have only 10 domains linked to it, then you will see drop in your traffic after getting 1 new link. I dont have site that has 100-300 domains linked to it, but it seems that if site has 100-300 domains linked and it gets 1 new link, then there is no drop in serp after getting that new backink. Cuz some old high PR sites get tons of links everyday and dont have any drops in traffic. You can see that in this screenshot, red line is google traffic. You can see drops in traffic after i get new links and then big drop for last 5-6 days, its because of new sitewide link. Why google do that all the time? Is that how antispam filter works?