OpenStreetMap.org should be added to the Geographic DB URL's autoselect and sidebar support on Areas & Places.

Place:

• 東京国際展示場 has geographic information at http://www.openstreetmap.org/node/261017046
• Sidebar: Open Street Map: 261017046

  http://www.openstreetmap.org/node/(\d+)
  

Area:

• San Francisco has geographic information at http://www.openstreetmap.org/node/26819236
• Sidebar: Open Street Map: 26819236

http://www.openstreetmap.org/node/(\d+)

Open Street Map URI/URLs don't discriminate between places and areas (in the MB) context, so make sure you put the right one in!