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Backlink Quality Scoring Methodology
Toxic Link Indicators (30 Patterns)
Definite Spam (auto-flag)
- Link from domain with 10,000+ outbound links per page
- Link from domain with no indexed pages in Google
- Link from domain registered <30 days ago with 100+ outbound links
- Exact-match anchor text from 5+ unrelated domains
- Links from doorway pages (thin content, keyword-stuffed)
- Links from hacked sites (pharma/casino injections)
- Links from known link networks (check against known PBN lists)
- Footer/sidebar site-wide links from unrelated domains
- Links from auto-generated content (spun articles)
- Links from domains with manual Google penalties
Likely Spam (manual review)
- Links from domains with >90% outbound link ratio
- Foreign-language domains linking to English content (and vice versa)
- Links from expired/auctioned domains repurposed for link building
- Links from pages with >50 outbound links
- Links from sites with no real traffic (parked domains)
- Reciprocal link patterns across 10+ domains
- Links from Web 2.0 properties with thin content
- Links from article directories (EzineArticles, ArticleBase)
- Links from low-quality guest post networks
- Links from unrelated niches (e.g., pet site linking to SaaS)
Potentially Problematic (monitor)
- Links from social bookmarking sites at scale
- Links from forum profiles (not discussions)
- Links from press release syndication networks
- Links from coupon/deal aggregators
- Links from generic directories (not industry-specific)
- Links with hidden/invisible anchor text
- Links from pages with cloaked content
- Links from sites with thin affiliate content
- Links from comment sections without editorial context
- Links from nofollow-only domains (limited SEO value)
Anchor Text Ratio Benchmarks by Industry
| Industry |
Branded |
URL |
Generic |
Exact Match |
Partial Match |
| SaaS |
40-55% |
15-20% |
10-15% |
3-8% |
10-15% |
| E-commerce |
35-45% |
15-25% |
10-15% |
5-10% |
10-20% |
| Local Service |
45-60% |
10-15% |
15-20% |
5-10% |
5-10% |
| Publisher/Blog |
30-40% |
20-30% |
10-15% |
3-8% |
10-20% |
| Agency |
40-50% |
15-20% |
10-15% |
5-10% |
10-15% |
Link Velocity Red Flags
| Pattern |
Signal |
Action |
| 10x normal new links in 1 week |
Possible negative SEO |
Investigate source, prepare disavow |
| 50%+ links lost in 1 month |
Penalty or site issues |
Check GSC for manual actions |
| Zero new links for 3+ months |
Content not attracting links |
Review content strategy |
| All new links from same TLD |
Coordinated link building |
Diversify sources |
| Spike from single country |
Link network activity |
Review geographic sources |
Disavow Recommendations
When to disavow:
- Domain has received a manual penalty from Google
- Clear evidence of negative SEO attack
- Toxic link ratio exceeds 10% of total profile
- Specific domains identified as PBN or link farms
When NOT to disavow:
- Low-quality links that Google likely ignores anyway
- Nofollow links (already devalued by Google)
- Links from legitimate but low-authority sites
- Small number of spam links (<2% of profile)
Disavow file format:
# Toxic domains identified by Claude SEO backlink analysis
# Date: YYYY-MM-DD
# Total domains disavowed: X
domain:spamsite1.com
domain:linkfarm2.net
domain:pbn-network3.xyz