I have ordered 1000 visitors but my counter on website counted only 600 hits. What is it?

There are the two most common reasons: Format «Pop-under», «Click-under» and «Back-under» are quite specific in nature, so after the advertised site has opened, visitors sometimes try to quickly close the window. Some of them are recorded by our statistics, but counter on your site does not load, therefore, counter does not record this visitor. To minimize this effect, your advertised site should open as quickly as possible, it will minimized the negative effects and increase the conversion. Many users set different antivirus and firewalls that block downloading of graphics on websites. Counters of the main ratings are designed in such a way that it record visitor only if he has loaded a counter picture. If the visitor on your computer is blocked downloads all graphics - it will not be recorder by counter. FastPromo uses the accounting system, which is different from the principles of counters and is independent of the graphics settings, so the stats of out system is closest to reality.