My domain was registered on September,2009.I had began to post some quality article Everyweek from June and these day I post each article everyday. All the content were indexed and each Keyword (I had many different kw) ranked at very good station. Especially, google index every page very fast.. for example , google get the page index-ed When I just click the publish button(My site is created by wordpree),as happened at the same time. I build backlink regular that looks like naturally. all types of backlink like Article submission ,social bookmark, blog comment, profile etc,mixed with both do-follow and nofollow. Now see what happened with this site below , June 10th. All keywords dropped from the rankings ,June 17th All KW returned and get better rank. June 28th All keywords dropped again, July 3rd Returned again. July 15th Dropped ,July 21st Returned. July 29th morning Dropped, night Returned, This time is the shortest Aug 6th Dropped,Aug 26th Returned,This time is the longest. Today,My site dropped Again!!! Is anyone have similar experience? And how can I solve this problem.I'm so sad ,Please give me some advice.Thanks a lot.