I looked at the existing answers, and I don't think anyone made this point: SO and its spinoffs are an example of do what you know.
People can smell when someone not from their domain tries to make something for them - and it does not smell good. In order for the SO model to work, they need experts versed in the area to be the core of the community. There are two ways to do this: try to attract such people after creating the site, or let the site organically arise because it was created by such people.
People can smell when someone not from their domain tries to make something for them - and it does not smell good. In order for the SO model to work, they need experts versed in the area to be the core of the community. There are two ways to do this: try to attract such people after creating the site, or let the site organically arise because it was created by such people.