GeoNames is a free API to get some geographical data. Nextpost uses this API to get some necessary data which is useful for selecting proper proxy address from the proxy list, detecting user language automatically etc.
Although it is not compulsory to integrate this API, we strongly advance to set-up this integration.
GeoNames integration is very simple. Just register a new account in http://www.geonames.org/ and enable web services for your account. After that simply insert your GeoNames username into the app. That's all!