Clicky will only log a campaign for a visitor's landing page (the first page they view). This helps eliminate unwanted duplicates and ensures we only count a campaign for visitors who actually arrived at your site via a campaign.
Clicky supports the "UTM" campaign variables made popular by Google Analytics and Urchin. One major difference however is that Clicky requires the "utm_campaign" variable. This is because our campaigns report groups camapigns together by their name, and utm_campaign is used to specify the name. If utm_campaign is not present but other UTM variables are, they will be ignored.