You don't want to url encode the ampersands in this case since you want to 
use as part of their reserved function for separating parameters.

This URL should work: 
http://search.twitter.com/search.json?geocode=37.781157,-122.398720,15km&lang=en&rpp=100&page=1

If you wanted to specify an ampersand inside a query parameter, then you 
would url encode it, but in this case, the &'s and the ? are special 
characters used for defining and separating parameters so you don't want to 
encode them.

Happy Hollidays,
David

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