Chapter 22 — Key Takeaways
A one-page reference. If you remember nothing else: a link is a vote, weighted by the voter and divided among everything it points at — and the only votes that last are the ones you earn.
The one idea
Links are the strongest off-page ranking signal because a link is an independent editorial judgment — one site vouching for another — that you cannot fake from your own pages. PageRank turned that into a score; twenty years of anti-spam turned the game from counting links into weighing them. Earned links compound; forged ones get detected and reversed.
PageRank in one breath
- A link is a vote. Votes from more authoritative pages count for more (the signal is recursive).
- A page splits its vote among its outbound links — the $C(T_i)$ divisor — so a link from a selective page is a concentrated endorsement; from a page that links to everything, a whisper.
- The damping factor (~0.85) is the "random surfer" who mostly follows links but sometimes jumps at random — it keeps closed link clusters from hoarding importance.
- The public Toolbar PageRank score died in 2016; the internal signal did not. "PageRank is dead" is a half-truth.
What makes a link valuable
| Dimension | High value | Low value / risky |
|---|---|---|
| Authority | Trusted, well-linked site | New, ignored, or spammy site |
| Relevance | Topically related source | Unrelated, or bulk-irrelevant |
| Anchor text | Natural, varied (brand, URL, descriptive) | Repetitive exact-match money phrases |
| Placement | In-content, editorially chosen | Footer, sidebar, bio, site-wide boilerplate |
| How acquired | Editorial — freely given | Paid, exchanged, self-placed, automated |
| Uniqueness | A new referring domain | The 500th link from a domain already linking you |
The link attributes (rel)
- (none) / "follow" — an ordinary link; a full endorsement that can pass authority.
nofollow(2005) — "not my endorsement; don't pass authority." Since 2020, a hint, not a directive.sponsored— the correct label for a paid/affiliate link (so it doesn't pass PageRank).ugc— user-generated content (comments, forum posts).
Rules of thumb
- Count referring domains, not backlinks. "80,000 backlinks" usually means a handful of real sources.
- External links fill the reservoir; internal links (Ch 15) route the water. Architecture can't manufacture authority — only distribute what you've earned.
- One earned editorial link can outweigh sixty manufactured ones — and the sixty can be a liability.
- nofollow links aren't worthless: real traffic, brand, possible ranking hints, and a natural profile contains them.
- Buying links is detectable and retroactively punished. The rise and the fall are the same event, seen twice (JCPenney, 2011).
The myth to kill
"Raise your Domain Authority and you'll rank." DA (Moz) and DR (Ahrefs) are third-party estimates — not Google metrics, not ranking factors. Google's own people say there is no single "domain authority" score in ranking. Use DA/DR to compare prospects; never as a goal (chasing it invites link buying).
What you can do today
Open Google Search Console → Links (free, and it's Google's own data). Record your referring-domain count, your top linking sites (relevant or junk?), and your top anchor text (natural or suspicious?). That baseline is the authority page of your Strategy File — and the honest answer to "why does my priority page rank where it does?"
Where this goes next
→ Chapter 23 (Earning Links) — if buying is out and links are this valuable, the only durable path is to be worth citing: linkable assets, digital PR, and outreach that isn't spam.