Register an app with twitter, making sure to specify Read + Write access
Clone this repo and add a config.yml file in the root directory with the following info for your app and graticule:
consumer_key: YOUR_CONSUMER_KEY
consumer_secret: YOUR_CONSUMER_SECRET
oauth_token: YOUR_OAUTH_TOKEN
oauth_token_secret: YOUR_OAUTH_TOKEN_SECRET
lat: YOUR_GRATICULE_LATITUDE
long: YOUR_GRATICULE_LONGITUDE
gem install twitter
ruby geohash.rb