This is the first in a series of posts I’m doing on the basics of online advertising. In this post, I’m focusing on online ad networks.
An ad network is an organizations which partners with other websites to sell inventory for them. They are leveraged by small websites who can’t yet justify hiring an sales force and larger publishers to augment the ads their salesforce sold directly.
Problem Ad Networks Solve
Advertising networks solve problems for both small websites that don’t yet have a salesforce and larger publishers who do. At a high-level, the problem being solved is the same for both groups: ad inventory is extremely perishable. If the inventory is not sold when the impression occurs, then the revenue is lost forever. For small websites the networks allow sites to begin monetizing their audience and web impressions long before the audience and number of impressions would be interesting to an advertiser directly. For larger publishers who already have a sales force and direct relationships with advertisers they allow publishers to deal with any perishable impressions which occur that they don’t currenly have an ad sold for. This can be due to a spike in traffic to the site (such as when a story reaches the homepage of Digg or Slashdot) or because of normal fluctuations in the ads sold.
How to Pick a Ad Network
If you are considering working with an ad network, there are a number of factors to consider including:
- Do you meet the qualifications to work with the network?
- Percentage of revenue the different options will share with your site
- How effective you perceive believe their ads will be
Do you meet the networks qualifications?
Like any type of partnership, both sides have to be interested in working together. Each of the ad networks has different criteria that a site must achieve before they will work with a site. These are typically based upon metrics about your site such as the number of page views and unique visitors your site receives in a month.
On a related point, you should also make sure that you don’t violate the terms and conditions of the network. For example, some networks don’t let you work with other networks at the same time.
Percentage of Revenue Shared
Interestingly, when a site is first starting out they are typically forced to take terms that are approximately a 50/50 revenue split. In one case, Google’s standard terms don’t even disclose what the revenue share is. From the Google AdSense FAQ:
Q: How much will I earn through this program?

…This means that advertisers pay either when users click on ads, or when the advertiser’s ad is shown on your site. You’ll receive a portion of the amount paid for either activity on your website. Although we don’t disclose the exact revenue share, our goal is to enable publishers to make as much or more than they could with other advertising networks…
However, as a site begins to generate significant revenue through the ad network you are able to apply leverage to get a much better deal. Obviously, when a publisher get’s large enough they can cut more advantageous deals, such as the AOL and Google alliance. However, for perspective both Google and Yahoo require significant traffic before being open to anything other than the standard deal. For example, the Yahoo! Strategic Partner Solutions requirements are:

If your site generates more than two million searches or 20 million page views monthly, you may be eligible for a customized program featuring a full range of Yahoo! products along with dedicated account management.
How Effective Do You Believe Their Ads Will Be
While the negotiations often quickly focus on the revenue share, it is important to keep in mind that you are sharing total revenue generated. To state the obvious, if one ad network can generate significantly more total revenue but shares a smaller percentage of that revenue, it may still end up generating more revenue for you.
Sometimes this is difficult to determine, because the advertisements may be sold more on a cost-per-some action basis rather than a pure cost-per-impression basis. For example, Google Adsense ads typically sold on a cost-per-click basis. In other words, the advertiser doesn’t pay unless a site visitor clicks on the ad. However, even in this case, it is possible to calculate an average CPM simply by multiplying the average Click-Through-Rate and the average Cost-Per-Click multiplied by 1000 (to get cost per thousand impressions.)
Process to Integrate Ads into Site
Integrating an ad network with your site can be done a number of different ways. For most small sites that don’t yet have an ad server and individuals selling ads directly for them, it is very easy to integrate. This typically just involves copying and pasting a small block of code into your site template.
At a later point, if a site is also selling ads directly, then the network will need to integrate with the site’s ad server. This is also typically straight-forward, but it should be pointed out with DoubleClick being acquired by Google it will be interesting to see how straight-forward it is to pull other networks ads into the DoubleClick server. DoubleClick’s DFP is the largest of the online ad servers.
Conclusion
Advertising networks serve a valuable function in the online publishing ecosystem. As more and more start-ups are founded with a business model of ‘monetizing eyeballs through advertising’ and more established publishers continue to focus on their online revenue, networks should only continue to gain significance.
I’ll continue this series soon, covering other topics around the basics of online advertising.