I think that contact info of an amenity (allow me to group shops,
restaurants, bars, and companies under that umbrella just for a
minute)
should be considered all of equal importance.
They are amenities that stay for long time like post offices. And
amenities that are changing very fast like shops and restaurants. I
think OSM should concentrate on the first. OSM is not a google-like
bot scanning the web to build automatically a yellow-page db.
Surveying things like commercial streets are inevitably outdated
quickly. I would say that "amenities" that cannot be found in
wikipedia should be considered as commercial advertising.
i just wanted to note that at least facebook and foursquare links
wouldn't only apply to shops, restaurants and companies (stuff with a
commercial value), but also sights and landmarks, cities, parks,
playgrounds, train stations. everything that has a location
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