Recently a domain I manage shot up in rankings for many industry related keywords in Yahoo! It only lasted for two days, but durring that time we saw about 300% increase in organic traffic. Durring that time we were spending a lot of money in paid ads. Can anyone explain the sudden surge in Yahoo! organic traffic and rankings? Could there have been traffic from our paid ads that tracked to organic search? We use Google analytics and an in-house tracking system that both showed the same trends.