Infolinks is one of the best online advertising network, it offers wide variety of option on how advertisement presented on its audience. In my opinion, the best one that will give a high CTR is the inframe for a reason that almost all the keywords are related on the blog contents. However, it bugs me down why Infolinks did not include an option on how inframe should be presented (left, right or both). The reason is, some website has an existing widget on their site and if you activate inframe, this will override those widget or can ruin the presentation of the website. In addition, the advertisement display on both sides are redundant.