How to Recruit the People Who Won't Sign Up

Every recruitment poster for a loneliness programme has the same flaw: it works only on people who already recognise they’re lonely, already feel comfortable asking for help, and already pass somewhere they’d see the poster. That filters out most of the people the programme was designed for. The National Academies made this structural, not incidental, when it found that roughly a quarter of adults over 65 are socially isolated — and isolation, by definition, means fewer chances to encounter your outreach in the first place.

This is the recruitment paradox of connection programmes: the people with the thinnest social networks are the hardest to reach through social networks. Word of mouth, community noticeboards, “ask your friends to come along” — all of it depends on exactly the infrastructure your target group lacks.

Why open calls select for the wrong people

An open call for a befriending group or a walking club reaches three kinds of people reliably: those who are mildly lonely and know it, those who are socially confident and enjoy new activities regardless of need, and those already inside some institutional contact — a GP, a community centre, a church. Research on how socially isolated older adults experience risk finds isolation and loneliness are separate constructs that don’t always travel together, and the people most at risk often show neither the self-awareness nor the network reach to respond to a general invitation. A programme measuring success by sign-up volume will look successful while missing exactly the population the evidence says needs it most.

Call this the volunteer’s dilemma: the people who self-select into a programme are, almost by construction, not a random sample of the target population — and are often the ones who would have found some form of connection anyway.

The five-step approach

1. Recruit through existing points of forced or routine contact, not through appeals

Isolated people still touch systems — a pharmacy, a housing officer, a GP appointment, a meals delivery, a benefits office — even when they touch no social networks. The National Academies’ consensus report calls on health care systems to routinely assess isolation precisely because clinical contact is one of the few reliable touchpoints an isolated person cannot avoid. Build referral routes into those touchpoints rather than around them: a pharmacist trained to ask one question, a housing repair visit that ends with a warm handoff, a hospital discharge process that flags isolation as a checklist item.

What this means in practice: stop asking “where do we advertise?” and start asking “where does this person already have to show up?” Recruitment through mandatory or routine contact reaches people that recruitment through choice never will.

2. Replace the poster with a person

Self-referral requires someone to identify their own loneliness, decide it’s addressable, and act on a printed instruction. That’s three points of failure. A warm referral — a trusted professional making an introduction by name — removes all three. Qualitative research on how people experience social prescribing found that participants describe the benefit as extending beyond social contact itself to a restored sense of purpose and participation, but that finding assumes people got through the door. The same body of work is consistent on how they got there: not through leaflets, but through a link worker, GP, or other trusted figure making a direct, personal connection.

Flyers still have a job — informing people who are already inclined to look for something — but budget and staff time should be weighted toward relationship-based referral, not print runs.

3. Design for the third space that’s disappearing, not the one that used to exist

Eric Klinenberg’s argument in Palaces for the People is that libraries, parks, and other shared physical spaces shape the rate of casual social contact independent of any programme layered on top. That infrastructure is thinning. Research tracking third-place availability across the United States between 2010 and 2021 found closures across every category tracked — coffee shops, libraries, museums, recreation centres, restaurants — concentrated disproportionately in census tracts with higher social vulnerability and in rural areas. If your recruitment plan assumes there’s a community hub where people already gather, check that it still exists in the specific neighbourhood you’re targeting. In many places it doesn’t, and the recruitment problem is partly an infrastructure problem you can’t advertise your way around.

4. Match outreach intensity to isolation severity, not to programme convenience

A single invitation letter suits someone who is lonely but connected enough to act on it. It does nothing for someone who is isolated, distrustful of institutions, or unable to leave home easily. Trials of structured interventions bear this out: a randomised controlled trial of befriending in residential aged care produced measurable reductions in loneliness scores — 2.39 points on the UCLA scale at eight weeks, 2.71 at sixteen — but that was achieved through sustained, individualised contact, not a one-off invitation. If your target group includes the most isolated tier, expect to need multiple contacts, a named person doing the reaching, and no expectation that one letter equals one enrolment.

5. Track who didn’t come, not just who did

Programmes almost never measure their non-responders, so they never learn what recruitment channel is systematically excluding people. Basic stratification — comparing age, living arrangement, referral source, and self-reported health of enrollees against the population your referral partners actually see — will tell you fast whether you’re recruiting a representative slice or the same self-selecting sliver every time.

Evidence status of the common recruitment claims

Claim	Evidence status
Warm referral outperforms self-referral for isolated populations	Consistent qualitative support; no controlled comparison exists
Routine clinical contact is an effective isolation-screening point	Recommended by consensus report; adoption and effectiveness at scale still unclear
Third-place loss reduces informal social contact	Documented geographically; causal link to loneliness outcomes is inferred, not measured directly
Structured, sustained outreach beats one-off invitation for high-severity isolation	Supported by at least one randomised trial in aged care; generalisability beyond that setting untested
Social prescribing referral pathways reduce loneliness at population scale	Adoption is growing faster than the trial evidence; a 2025 review protocol notes only one peer-reviewed randomised controlled trial exists for older adults specifically

What this does not solve

None of this fixes a programme with no capacity. Warm referral and multi-contact outreach are staff-intensive by design; they cost more per enrollee than a poster campaign, and funders comparing cost-per-head across programmes will see this approach look expensive before it looks effective. It also does not solve for people who are isolated by choice — some proportion of any target population is not missing connection, and no recruitment method should treat their non-participation as a failure to be corrected. And it does not solve the reach problem outright: even a well-built referral pipeline through GPs and pharmacists still depends on those institutions being staffed, trusted, and willing to ask the question, which in under-resourced areas is exactly where third-place infrastructure has already thinned out the most.