The common advice is to build authority off your own site through digital PR, mentions, and high-authority links. Grow your third-party mentions, grow your AI visibility, right?
Right instinct. But the source-set that an AI relies upon differs for every topic, so your off-property authority building efforts must also be topic-driven.
This week:
- Why AI trusts a different set of sources for every topic, and what that changes about where you build it.
- Why scattered off-property authority wastes budget, and how to aim it.
- How to find the exact sources AI cites for your topic and earn your way in.
AI builds a different trusted-source set for every topic
AI search engines rebuild which sources to trust around the subject of the question. Ask about invoicing, and it leans on one set. Ask about starting a business, and it leans on a mostly different one.
This data is a sample set from an anonymous pool of clients, but it illustrates the gap is large. AI citations follow a source-type pattern specific to the topic.
In invoicing questions, competitor domains hold 33.5% of what AI cites. In starting-a-business questions, that same source type holds 7%. Same model, two topics, and the kind of source it reaches for nearly flips.
This small sample analysis confirms something I wrote about in “Operationalizing your topic-first SEO strategy”:
- “You should be employing a topic-based backlink strategy, too. You don’t just want backlinks. You want links that have authority in your target topics and/or with your audience.”
Meanwhile, video and social surfaces run on separate mechanics and deserve their own separate play in your visibility mix, cited at ~6.5% across this sample set.
YouTube remains an exception across LLMs, and UGC platforms like Reddit behave differently again. But this memo sets aside the video/social/UGC slice deliberately and covers the publisher, research, and expert sources that behave like earned media.
So where you build authority depends on the topic you want to win. Lift a PR plan from a neighboring topic or vertical, and you’re likely to aim at the wrong sources.
AI trusts entities it already recognizes
AI does not form a fresh opinion about your brand on every query. It reuses the trust already attached to the sources it pulls from, and it favors documents and entities it already associates with authority on that topic. (Which is why, yes, building topical authority still matters.)
Your owned blog/site is one input. It’s a crucial input, but it’s likely one of the weakest. The publications, analysts, experts, competitors, and communities that mention you carry significant weight.
That gap is why two brands with identical on-page optimization can get cited at different rates: off-property reputation the model already trusts.
Add to that, a named author with a byline appears to beat the same content published under a brand. We don’t have a clean…
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