Evidence base
Gallup
How Strong Are the World's Social Connections?

What it found
Gallup's analysis breaks down social connectedness across countries and demographic groups, drawing on its global data. A key finding is that connectedness and loneliness should not be treated as simple inverses of one another; a person can score low on one without scoring high on the other.
Why it matters for practice
This matters for anyone designing measurement tools: if you're only tracking loneliness as a proxy for connection, you may be missing the people who report weak connectedness without describing themselves as lonely. Read this alongside programme-level evaluation work rather than as a substitute for it, since the analysis is descriptive and cross-national rather than diagnostic of what drives the gap.