My website is 1.5 year old with PR4. Last few months my daily traffic was arround 600 users. 70% from search engines. Yesterday something strange happend. I received over 6000 users almost exclusively from google. I watched google analytics Real-Time section and saw whole day 60 - 130 active users on site. (Usually i have like 0 - 5) AdSense and other earnings skyrocketed by factor 10 All traffic were organic from Google coming to a single page targeting California related long tail Google didnt provide me the keywords - (not provided) Unfortunately it lasted only one day. At this moment - day later I have only 13 active users so its fading away to normal. I wish I knew what happened with my site that day. Anyone experienced something similar? BTW, I dont actively build any backlinks for my site.