I didnt know whether to put this in white or white hat as my main method of link building is blog spamming but, its a general question. I had two days a go 5 micro niche sites sitting first for there keywords but yesterday they all dropped a few places, dropping my overall traffic and income by 75%. has something changed in the algarythm of google?, sorry I cant spell. Or could it be that the blogs are I have got links from have devalued or have been spammed by hundruds more spammers? I tend to spam the same blogs on all my sites to get links, this could be the reason but unsure? or maybe my sites have some kind of penalty?