Hey, hopefully someone can help me out here, about 2 months ago, one of my sites that normally gets about 75-100 visitors/day all of a sudden started getting around 2,000 visitors a day.

The extra visitors were all "direct" visitors, I can't find through google analytics or my cpanel where they are coming from.

This traffic lasted about a month, then went back to where it was before, 90% natural search traffic.

Same thing happened yesterday, different site, averaged 200-250 visitors per day, got 1500 yesterday, and looks like the jump in traffic is continuing today as I have about 700 already. Same deal, all direct traffic.

Does anyone have an idea on how this happened, or where I can go to find out where this traffic is coming from? It's different traffic than the natural results, most of my sites are adsense sites. The first site has a normal click-through ratio of about 8%, with the spike in traffic it dropped to just under 4%. The current site has a click through of usually 10-12%, yesterday and so far today that click through ratio is down around 6%.

Any help would be appreciated. I love the extra traffic, but would like to know where it is coming from!