Sustainable Link Building: Links That Stay Live and Keep Counting
Sustainable link building means links that stay on the page, keep passing credit and fit Google's spam policies, earned at a pace you can keep up. Below: what happened to links after they went live in MentionAgent's nightly checks, and which link types Google allows.
Earn links an editor has their own reason to add: a relevant page, a fixed broken link, data, an existing mention. Don't pay for followed links. Then check each link is live, because a promise is not a link.
Allowed vs link spam: the table
MentionAgent re-checks every live link each night. Of links it saw live between 26 September and 18 October 2026, 98% were still on the page at the last check. 6% carried nofollow, sponsored or ugc.
Where a price came up: 16% were tagged, against 5% where none did.
What happened to links after they went live
When an editor agrees to a link, MentionAgent fetches the page, finds the link in the HTML and records its rel attribute, then fetches it again every night. Shares across all workspaces, 26 September to 18 October 2026:
| At the last nightly check | Share of links seen live |
|---|---|
| Still on the page | 98% |
| Removed | 2% |
| Tagged nofollow, sponsored or ugc | 6% |
| Tagged, among links where the publisher had quoted a price | 16% |
| Tagged, among links where no price came up | 5% |
Three weeks is short, so this shows links rarely vanish soon after going live, not how they age over a year. The priced group is small; read its tag rate as a direction. A separate check matters more: when MentionAgent fetched every placement its records held on 16 September 2026, 31% of the pages loaded without the link (the audit). Open the page; don't trust the email.
Which links Google allows
From Google's spam policies (updated 28 August 2026), which say sites that break them "may rank lower in results or not appear in results at all":
| Link type | Google's position |
|---|---|
| Editorial link an editor chose to add | Allowed |
| Paid link marked rel="sponsored" or rel="nofollow" | Allowed: "It's not a violation of our policies to have such links as long as they are qualified" |
| Paid followed link | Link spam: "Exchanging money for links, or posts that contain links" |
| Link swaps | Link spam when "Excessive" or on "partner pages exclusively for the sake of cross-linking" |
| Links made by software | Link spam: "Using automated programs or services to create links to your site" |
Already bought followed links? See buying backlinks and how to disavow backlinks. Swaps: link exchange.
Tactics that hold up
Each gives the editor a reason to link that isn't payment:
- Replace a dead link on a page in your niche: broken link building.
- Get listed on a resource page for your topic: resource page link building.
- Ask for a link where you're already named: unlinked brand mentions, link reclamation.
- Publish data or a guide others cite: editorial link building, digital PR.
- Write for sites your audience reads: guest posting.
Set a monthly target you can afford (how many backlinks you need) and expect months, not weeks (how long link building takes). More on staying inside the rules: white hat link building, natural link building, unnatural links warnings.
Is link building still worth doing?
Google's link best practices page opens: "Google uses links as a signal when determining the relevancy of pages and to find new pages to crawl." The full method: how to build backlinks and the link building checklist.
Outreach you can run every month
MentionAgent finds relevant sites and the editor's email, drafts each pitch for you to approve or send on auto, and re-checks every live link nightly. It doesn't buy links. From $99/mo.
See how MentionAgent worksFrequently asked questions
What is sustainable link building?
Earning links that stay on the page, keep passing credit and fit Google's spam policies, at a pace you can keep up.
Are link exchanges sustainable?
Google's spam policies don't ban swaps outright. They list "Excessive link exchanges" and partner pages that exist only to cross-link as link spam, so keep swaps few and relevant.
How do I know my links are still live?
Fetch the page and look for the link in the HTML, then repeat on a schedule. Check the rel attribute too: a link changed to nofollow or sponsored is still on the page but no longer a followed link.