Media Bias/Fact Check Source Credibility Scraper

Pull structured source-credibility records from Media Bias/Fact Check (MBFC) — the largest media-source reliability database on the internet (~7,000+ profiles).

For each outlet, returns:

• Bias rating (normalized slug + verbatim MBFC label)
• Factual reporting tier
• MBFC credibility rating
• Country and country press-freedom rating
• Media type and traffic tier
• Full History, Funded by / Ownership, and Analysis / Bias prose sections

Use Cases

• Fact-checking pipelines — source-level trust layer alongside claim-level fact-checkers (PolitiFact, Snopes)
• Disinformation research — identify and filter conspiracy-pseudoscience / questionable sources
• Brand safety — screen media sources before advertising placement
• RAG source-filtering — weight or exclude sources by credibility rating before ingestion
• OSINT / media-literacy — annotate article URLs with source bias and credibility metadata

Input

Field	Type	Default	Description
mode	string (required)	all	all = full corpus; category = selected bias categories; seed = explicit profile URLs
categories	string[]	—	Bias categories when mode=category. Options: center, left-center, left, right-center, right, pro-science, conspiracy-pseudoscience, questionable, satire
seedUrls	string[]	—	Explicit MBFC profile URLs when mode=seed
maxItems	integer	200	Maximum source profiles to return (0 = unlimited)
includeBody	boolean	true	Include History / Funding / Analysis prose sections

Output

Each record contains:

{
  "sourceName": "247Sports",
  "sourceUrl": "https://mediabiasfactcheck.com/247sports-bias-and-credibility/",
  "sourceHomepage": "https://247sports.com",
  "biasRating": "center",
  "rawBiasRating": "LEAST BIASED",
  "factualReporting": "HIGH",
  "credibilityRating": "HIGH CREDIBILITY",
  "country": "United States",
  "countryFreedomRating": "MOSTLY FREE",
  "mediaType": "Website",
  "trafficPopularity": "High Traffic",
  "categoryIndex": "center",
  "history": "247Sports, established in 2010 by Shannon Terry...",
  "fundedByOwnership": "247Sports is owned by CBS Interactive...",
  "analysisBias": "247Sports focuses on sports news...",
  "articleJsonLd": { "...": "..." },
  "bodyMarkdown": "## History\n\n...",
  "status": "success",
  "errorMsg": ""
}

Bias Rating Normalization

MBFC Label	Normalized Slug
LEAST BIASED	center
LEFT-CENTER BIAS	left-center
LEFT BIAS	left
RIGHT-CENTER BIAS	right-center
RIGHT BIAS	right
PRO-SCIENCE	pro-science
CONSPIRACY-PSEUDOSCIENCE	conspiracy-pseudoscience
QUESTIONABLE SOURCE	questionable
SATIRE	satire

Predefined Dataset Views

• Source Credibility Table — sourceName, sourceHomepage, biasRating, factualReporting, credibilityRating, country
• Low-Credibility Sources — focused view for conspiracy-pseudoscience, questionable, and low-credibility sources

Architecture

Pure HTTP two-level hierarchical crawl using CoreCrawler. No browser.

Level 1 (category):  Walk each MBFC bias-category index page
                     (/center/ /leftcenter/ /left/ /right-center/ /right/
                      /pro-science/ /conspiracy/ /questionable/ /satire/)
                     → parse <table> of source profile links
                     → link text "Source Name (domain.com)" → extract sourceHomepage

Level 2 (profile):   Fetch each source profile page
                     → parse "Detailed Report" block for structured fields
                     → extract History / Funded by / Analysis sections
                     → extract JSON-LD Article metadata

Rate-limit handling: CoreCrawler detects 429 responses and backs off exponentially. MBFC enforces per-IP rate limits on aggressive crawlers; the actor uses polite concurrency (3 concurrent requests max).

Crawl Modes

mode=all (default): Walks all 9 bias-category index pages and fetches every source profile in the corpus (~7,000 profiles total). Suitable for full-archive downloads.

mode=category: Walks only the specified bias categories. Useful for targeted pulls (e.g., all conspiracy-pseudoscience sources for a disinfo pipeline).

mode=seed: Fetches only the explicitly provided MBFC profile URLs. Suitable for spot-lookups or updating specific source records.

Performance

• Default memory: 512 MB
• Full corpus run: ~7,000 profiles at polite 1-3 req/s ≈ 2-4 hours
• Category run (e.g., center ~500 profiles): ~15-30 minutes
• Seed run (single URL): under 1 minute