Advertisers interested in reaching people on single-issue, interest-oriented or otherwise highly specific websites will want to work with Vertical Networks, a more specialized version of contextual networks. Here they can literally blanket a field of interest with a high level of confidence that nearly everyone who cares about it will sooner or later be exposed to their advertising. Although most advertisers might consider this inventory low value because of the relatively limited reach or specialized nature of the audiences delivered, from a verticals perspective these ad slots can be prime real estate.

Examples include:
BlogAds: blogs
ClickDiario: Spanish-language sites
Jumpstart Automotive Media: automotive
NetShelter: 5 tech channels: IS/IT computing, tech & gadgets, consumer electronics, developer and games
NetShelter Branded Network: technology
Travel Ad Network: travel