Internet site access monitoring

A server having instructions stored on a storage medium which when executed cause the server to perform actions to monitor user access of advertiser websites, the actions comprising:

• receiving over a network from a user computing device a user specified search query;
• preparing a search response including a trigger script and at least one advertiser link, the advertiser link including a coded link;
• providing the search response to the user computing device over the network;
• recognizing user activation of a first advertiser link at the user computing device;
• receiving over the network advertiser link selection information and a unique identifier sent by the trigger script at the user computing device;
• providing to the user computing device an advertiser web page of an advertiser website and a hidden frame including a tracking script;
• receiving over the network a notification from the tracking script at the user computing device when the user clicks on a link on the advertiser web page, wherein the notification includes a time, a web page identifier and the unique identifier;
• evaluating a page depth based on the web page identifiers included in a plurality of notifications received from the user computing device over the network, the evaluating including calculating the difference between time ordered user visits to advertiser web pages and a tally of the number of clicks made through the search response;
• tracking user access to the advertiser website based on at least the time and the unique identifier included in the plurality of notifications;
• identifying click fraud indicated by the page depth and a time between clicks;
• preparing a quality ranking of a plurality of advertiser website visits based on a computation of the time between clicks derived from the plurality of notifications.

A machine readable medium having instructions stored thereon which when executed cause a server to perform actions to monitor website access, the actions comprising:

• receiving from a user computing device over a network a user specified search query;
• preparing a search response including a trigger script and at least one advertiser link, the advertiser link including a coded link;
• providing the search response to the user computing device over the network;
• recognizing user activation of a first advertiser link;
• receiving from the user computing device over the network advertiser link selection information and a unique identifier sent by the trigger script in response to the recognizing;
• providing to the user computing device over the network an advertiser web page of an advertiser website and a hidden frame including a tracking script;
• receiving a notification from the tracking script when the user clicks on a link on the advertiser web page, wherein the notification includes a time, a web page identifier and the unique identifier;
• evaluating a page depth based on the web page identifiers included in a plurality of notifications, the evaluating including calculating the difference between time ordered user visits to advertiser web pages and a tally of the number of clicks made through the search response;
• tracking user access to the advertiser website based on at least the time and the unique identifier included in the plurality of notifications received over the network from the user computing device;
• identifying click fraud indicated by the page depth and a time between clicks;
• preparing a quality ranking of a plurality of advertiser website visits based on a computation of the time between clicks derived from the plurality of notifications.