To put this more into context, the facebook page does have a link to OpenStreetMap behind the faint "i", and the majority of contributors may eventually see this as reasonable attribution for the small map they initially show, but it is quite clearly not suitable on the bigger popup map to make everybody who sees the map aware that the data is from OpenStreetMap. The license is only visible if you click a second time ("map data legal notices"), while the "© OpenStreetMap" text could be even seen as misleading (because the license if not presented at the same level).
Whether this is actually a copyright infringement of the license may be up to a legal decision, although in my interpretation of 4.3 "a notice associated with the Produced Work reasonably calculated to make *any* Person that uses, views, accesses, interacts with, or is otherwise exposed to the Produced Work aware that Content was obtained from the Database, Derivative Database, or the Database as part of a Collective Database, and that it is available under this License." it clearly is not making any person that is exposed to the work aware that it is from OSM nor of the license. But it is clear that it is not in line with the OSMF interpretation of the requirements, we have delineated here: https://www.openstreetmap.org/copyright/ *"For a browsable electronic map, the credit should appear in the corner of the map."* This is a very essential thing for OSM, it is the guarantee that our word is spread, users are becoming familiar with our name and ultimately that our community will grow. Other widespread online mapping services also require this kind of *attribution on the map*, usually even more prominently (brand logo with much bigger size than our textual example). Cheers Martin
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