OR inside, AND across
Pick two seniorities inside the Job Seniority facet and LinkedIn shows anyone who is either, so the audience grows. Add a second facet, say Industry on top of Seniority, and a member now has to match both, so the audience shrinks. Every separate facet you stack multiplies the narrowing, which is how a healthy-looking audience collapses to a fraction of itself. Meta detailed targeting works the same way: OR inside a box, AND across boxes.
The double-cut trap
Some facets encode the same signal, so stacking them cuts the same people twice for no extra precision. Job seniority and years of experience are the classic pair: a title already implies seniority. And even the narrowed number overstates delivery, because LinkedIn says the accounts you actually reach are fewer than the target audience size. We work through both in the LinkedIn audience number is not your audience. Outside LinkedIn, Microsoft Ads can use company, industry and job function too, but only to adjust search bids: see LinkedIn profile targeting.
Common questions
Does adding a LinkedIn targeting facet grow or shrink my audience?
Adding more values within one facet grows it (OR logic). Adding a separate facet shrinks it (AND logic), because members must match both. Stacking several separate facets narrows the audience quickly.
Which LinkedIn facets should you not stack?
Facets that encode the same signal, most commonly job seniority and years of experience, because a job title already implies a seniority level. Pick the stronger one rather than layering both.