Targeting right audiences is the key power of advertising campaigns. The variety of targeting technologies ranging from contextual, demographic, behavioral ending with geographic and retargeting have emerged into the market enabling advertisers to track potential buyers or tempt a site visitor to click on the timely delivered ads. Ad Networks try to dig out new methods of increasing ad relevancy on publisher’s sites. So far probably the most ubiquitous ways of targeting remain contextual and behavioral targeting. Both advertisers and publishers find themselves in favorable situation as long as ads are delivered to right users at the right time and place. An ad for iPod running on a Music blog is OK, as long as it bypasses the post telling about a girl gotten in a car accident because of being too much into her iPod. Although all advertising technologies have brought their own advantages into this industry, each of them still has its pitfalls. The privacy of Internet Users has become more serious in its contrast to the relevancy of ads. This is an issue that grows in gravity more and more as targeting technologies go with pulling user information and constantly tracking them on the web. It’s good that semantic targeting providing companies are emerging into the market. Judging from the tendencies in current market of advertising technologies, semantic targeting is going to become a major tool for ad networks to maximize revenue. But for ad networks to make sure these technologies are really effective and truly semantic, few companies cross the borders of technological secrecy and present basics of their technology. As far as I know, Peer39 have a demo of their product which is available for their clients in Peer39 offices, while 4AdNetowrks provides a web demo-trial run of their semantic technology on their website. Other semantic providers seem to be preserving the "semantic genuineness" of their technologies. If you know other semantic "targeters" , feel free to give some information.