Petro Hrys
Research
Studies of search systems, indexing behavior, and crawl architecture.
Scope
Research here focuses on how search systems behave end-to-end — how crawlers discover and re-discover URLs, how indexers store and rank documents, how retrieval systems compose results, and how the web's surface area shapes what becomes findable. Entries are empirical where possible: small experiments, comparisons of observable behavior across engines, and notes on the systems beneath them.
Adjacent work in entity architecture, structured data, and AI-driven retrieval is cross-linked rather than duplicated.
Collections
Published research databases and one tool for the three actionable distribution collections. Each database defines its evidence boundary, is exportable as CSV and states what it excludes.
- Business DirectoriesA country-by-country index recording what each directory accepts, how it links, and when it was last verified.
- Business Listing OpportunitiesThe working database: where a company can create, claim or apply for a public profile, with cost, listing action and priority for each.
- Media, PR & Publishing PlatformsWhere a company publishes, submits, pitches, sponsors, launches or contributes expertise — media outlets, press release networks, contributor programmes, launch platforms and journalist-source services, with the opportunity type and the route for each.
- Product Launch PlatformsA ranked database of launch boards, startup directories, AI and software discovery platforms, separated by follow evidence, price, indexability and Ahrefs Domain Rating.
- Regional MediaRegional and local news publishers organized by world region, subregion, country, coverage area, Ahrefs Domain Rating, publication route and observed link evidence.
- Marketplace & Classified PlatformsWhere a business or a person publishes a listing rather than a profile — classifieds, vehicles, property, jobs, services, B2B trade, auctions and resale — with the type, the cost to list and who may list.
- ForumsA neutral inventory of public discussion communities, directly verified and classified by topic, country, language, forum type, activity and Ahrefs Domain Rating.
- Tender & Procurement PlatformsVerified public-sector tender and procurement portals, with jurisdiction, access model, opportunity coverage and evidence for each source.
- Country IntelligenceOne country at a time: every directory, marketplace, media outlet and tender platform this project has verified for that market, with Domain Rating, cost and whether anyone can act on it today.
Choose across all three
Each database above answers a different question. Business Directories is where a company creates or claims a professional profile. Marketplace & Classified Platforms is where it publishes a listing or an advertisement. Media, PR & Publishing Platforms is where it pitches, publishes, launches or sponsors. Regional Media and Forums inventory publishers and communities but do not infer publication or posting access, so they are deliberately outside Planner readiness. The planner combines only the three evidenced action classes and never pretends they are equivalent.
Entries
Individual studies arrive in Phase 2. Until then the collections above are the published work.
Related
Existing relevant writing: Artificial intelligence as a practical operating layer · Blog archive.