Publisher discovery: where buyers find publishers they have never used
Part of Lookalike websites
The short answer
Publisher discovery means finding publishers a buyer has never used. Useful sources sit outside ad platforms: press and publisher association directories, journalism award archives, citations in reference works, link graphs, newsletters and local directories. Each surfaces a different kind of site, so log the source of every find and check each one is a real, buyable publisher.
Key takeaways
- Ad platform inventory lists show who already sells at scale; discovery sources outside them show who exists.
- Each source has its own bias: associations favor members who pay dues, award lists favor outlets that enter, link graphs favor well linked sites.
- Working at least three different kinds of source keeps one source's bias from shaping the whole list.
- A discovered site is only a lead until it passes the publisher, quality, seller and audience checks.
- Logging where each site came from lets the client see the method and lets the next planner repeat it.
Where do buyers find publishers they have never used?
A site list built the familiar way starts from what a buying platform already shows: the top domains in a category, last year's plan, or a seller's package. That inventory is real, but it leans toward publishers that already sell at volume. Publishers a buyer has never used can be smaller, newer or more specialized, and they are found where publishers gather for their own reasons: associations they join, awards they enter, reference works that cite them and the links other editors give them.
Definition
- Publisher discovery
- Finding candidate publishers from sources outside the buyer's usual inventory lists, recording where each was found, and passing every candidate through the same checks before it reaches a plan.
Discovery differs from expanding a seed site. Seed based work starts with one site the client likes and looks for others that resemble it, which the find similar websites guide covers step by step. Discovery starts from places where publishers are listed, so it can surface sites unlike anything the client has seen, including local outlets and specialists that no seed would have pointed to.
Which discovery sources surface independent publishers?
No single source lists every publisher, and each one carries a bias the planner should name. The table catalogs the main sources, what each tends to surface, and where it falls short.
| Source | Example of where to look | What it tends to surface | Built in bias |
|---|---|---|---|
| Publisher associations | LION Publishers (opens in a new tab) lists its current members, independent local news businesses in the US and Canada | Independent, owner run local and niche news sites | Only members that joined and pay dues; misses outlets that never heard of the group |
| State and provincial press associations | The Colorado Press Association (opens in a new tab) offers a member finder for its community newspapers, online news sites and nonprofit news outlets | Community papers and their websites, town by town | Weighted to print heritage outlets; newer digital only sites may not join |
| Journalism award archives | The Online Journalism Awards (opens in a new tab) from the Online News Association keep winners pages by year | Digital outlets with strong editorial teams | Only outlets that chose to enter the competition |
| Subject award programs | The James Beard Foundation Awards (opens in a new tab) include Media Awards for books, broadcast media and journalism | Specialist writers and outlets inside one subject | Prestige leans to national names; the Media Awards also cover books and broadcast media, not only ad supported sites |
| Citations in reference works | Wikipedia's Special:LinkSearch (opens in a new tab) lists pages that link to a given domain | Outlets other editors treat as a source worth citing | Favors older outlets; a citation shows notice, not current quality |
| Link graphs | Common Crawl web graphs (opens in a new tab) release host and domain level link data | Sites that link to and from known good publishers | Large, well linked sites dominate; needs data skills to use |
| Newsletters and local directories | Subject newsletters' recommended reading, chamber of commerce media lists, city guides | Very small and very local publishers | Hard to search, uneven quality, links can point to non publishers |
How do industry associations help find publishers?
Associations work as a partial register of publishers. A press association exists to represent publishers, so its members are outlets that identify as publishers and joined the group. LION Publishers (opens in a new tab), which stands for Local Independent Online News, says it has more than 450 members across the US and Canada. The Colorado Press Association (opens in a new tab) describes itself as a nonprofit trade association with more than 150 members, including community newspapers, online news sites and nonprofit news outlets. Those two directories alone cover very different ground in one state.
Working one association directory for a brief
- Pick the association that matches the brief's geography or subject. State press associations for a regional plan, subject associations such as food writers or trade press groups for a vertical.
- Export or copy the member list. Keep the member name, the town and the website the directory gives, not a search result for the name.
- Drop members without a working website. Some members are print only; note them as direct buy ideas rather than deleting them.
- Read each site's recent coverage. Open several recent articles and note whether the subjects touch the brief at all.
- Tag the source. Record the association and the date the directory was read beside every site kept.
Association lists also show what the brief should not expect. A state directory may hold dozens of weekly papers whose websites update once a week. That is fine for a community brief and wrong for a fast news brief, and it is better to learn it from the directory than from a delivery report.
How do you check a discovered site is a real publisher?
A discovery source gives names, not verdicts. Directories go stale, award winners close, and link graphs happily return stores and brand blogs. Before any discovered site enters a plan, confirm that it is a publisher that produces its own editorial work and sells advertising.
Is this discovered site a real, buyable publisher?
- Recent articles carry dates and bylines, and new ones appeared in the last few weeks.
- An about page or masthead names the people who run the site and how to reach them.
- The site states its editorial principles somewhere public; schema.org defines publishingPrinciples (opens in a new tab), with sub properties such as correctionsPolicy and ownershipFundingInfo, for publishers that mark this up.
- The site is not mainly a store, a brand's marketing blog, a marketplace or a page of links.
- An /ads.txt file sits on the root domain, as the ads.txt 1.1 specification (opens in a new tab) asks publishers to post it, or the planner has noted that it is missing.
- The OWNERDOMAIN line in ads.txt, where present, names the business that owns the site, which helps spot sites run by one group.
- The seller accounts in ads.txt appear in the exchanges' sellers.json (opens in a new tab) files with a matching seller_type.
- Page layout and ad load pass the same made for advertising review as every other site on the plan.
A missing ads.txt file is a reason to look closer, not proof of a bad site. A small publisher may sell space directly or through one partner and never set the file up. Note it, and decide with the client whether the site goes to a direct buy list or waits until its selling path is clear. Sites that fail on editorial grounds, such as no dates, no names and recycled text, leave the list with the reason recorded.
How do you log discovery sources for a client?
A discovery log turns a list of names into a method the client can inspect. It answers a question clients ask, "where did this site come from?", and it lets the next planner rerun the same routes a quarter later and see what changed. Keep one row per site, and one column per fact the client might question.
| Column | What goes in it | Example entry |
|---|---|---|
| Site | The root domain, as it would appear in a placement file | examplebakes.example |
| Found through | Every route that surfaced the site, not only the first | State press association; cited on two encyclopedia pages |
| Date found | When each source was read | October 21, 2026 |
| Evidence | Two or three recent article URLs that tie the site to the brief | Article URLs on altitude adjustments for bread |
| Checks | Publisher, quality, ads.txt, sellers.json and audience results | Publisher yes; ads.txt present, one direct seller |
| Decision | Core list, adjacent idea, direct buy idea or left out, with the reason | Core list, regular baking column |
Counting the routes is useful on its own. If almost every kept site came from one association, the plan carries that association's bias, and the client should know. If most came from link graphs, expect larger sites and fewer local ones. The fair publisher planning guide explains how to check that a list does not lean against independent and small publishers.
What does publisher discovery look like on a real brief?
Fictional example
A home baking supply shop plans display across Colorado
An unnamed fictional Denver shop selling baking supplies and flour blends made for high altitude kitchens briefs its agency for display across Colorado. The client wants local food writing and community sites, and its last plan held only national recipe portals.
The planner works four routes. The state press association's member directory gives community papers in mountain towns, several with weekly food columns. The independent news association's member list adds two digital only local sites in Colorado. Award archives in food journalism point to a Colorado food writer whose newsletter links to her own ad supported site. An encyclopedia link search shows which local outlets are cited on pages about Colorado food and dining.
Checks thin the list. Three community papers update weekly and carry ads.txt with a direct seller, so they join the core list. One award winner turns out to be a cookbook with no advertising and drops out with the reason. A recipe site found through a link graph shares its layout and ad codes with four others and is reviewed as one network. The client sees every site with the routes that found it.
How does PlacementGraph help find publishers beyond the usual list?
Frequently asked questions
Are association members safer to buy than other publishers?
Not automatically. Membership shows that an outlet identifies as a publisher and joined a group, which is a useful start. It says nothing about current ad load, selling path or audience in the brief's market. Run the same checks on association members as on any other discovered site.
Can a discovered publisher be bought if it sells only through its own ad sales team?
Yes, but not through an open exchange. A site that sells direct can be bought through an insertion order or a programmatic guaranteed deal the publisher sets up. Put such sites on a separate direct buy list so the trading desk knows they need a different route.
How current does a discovery source need to be?
Current enough that the sites still exist. Directories and award pages can list outlets that closed or changed hands. Record the date each source was read, open every site before it is checked, and drop any whose latest articles are months old unless the client accepts a slow publishing pace.
Should a planner contact a discovered publisher before adding it?
Only when a check cannot be finished from public information, such as a missing ads.txt file or an unclear owner. A short note asking how the site sells its space can settle it. Keep the reply in the discovery log, since it is evidence for the decision.
Sources
- Current members (opens in a new tab)LION Publishers
- Find a member (opens in a new tab)Colorado Press Association
- Online Journalism Awards (opens in a new tab)Online News Association
- Awards (opens in a new tab)James Beard Foundation
- Help:Linksearch (opens in a new tab)MediaWiki
- Web graphs (opens in a new tab)Common Crawl
- publishingPrinciples (opens in a new tab)Schema.org
- ads.txt specification version 1.1 (opens in a new tab)IAB Tech Lab, on GitHub
- sellers.json specification (opens in a new tab)IAB Tech Lab, on GitHub
Researched and written by PlacementGraph Research. Read how we research, source and update these pages. Corrections: diana@placementgraph.com.