Because of advertising strategies, many companies who dominates the world wide web uses this strategies. An example of this was using coupons and other prizes. Can take note this are being applied to their websites, a specific example was buy.com coupons . These websites uses coupons especially when you are browsing to their website and you are really doing something like interaction, answering survey or just posting an opinion. This kind of strategy is really affected to increase the traffic of their website. So, if you happen to encounter these then lucky for you for the goodies will be delivered to your door step soon.