A community noticeboard, whether a physical board outside a shop or a simple local online group, gives residents a low-effort way to post small, everyday requests and offers, a lift needed, a lost pet, a spare ladder, that would rarely justify any more formal channel of communication.
The genuinely small scale of these requests is part of what makes the noticeboard useful, since a problem too minor to bother a council or a formal service about, a stuck garden gate, a one-off request for help moving furniture, often finds a willing, nearby neighbour within a day or two.
Over time, a well-used noticeboard becomes a quiet record of a neighbourhood actually helping itself, small requests met by small, local offers, without needing any larger institution to coordinate an exchange that neighbours were, in the end, perfectly capable of arranging directly among themselves. It is worth persisting with, even when the early returns feel modest.