For example:

Place lookup for Portland, OR: 
http://api.twitter.com/1/geo/id/ac88a4f17a51c7fc.json

Returns as part of the result:

"attributes":{"162772:pop100":"529121","162772:place_id":"4159000"}

What does the 162772 signify?  I believe the "162772:pop100"
represents population from 2000 census (I'm saying 2000 based on spot
checking a couple of cities).  But, will this 162772 change?

What does the place_id represent?  It's not a woeid, and it's
different than the twitter place_id (or is it?  maybe the place_id in
the URL is a hash of this?)

Thanks!

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