Add a post to a foursquare checkin

create_4sq_post.rb

def create_post
    url = URI.parse("https://api.foursquare.com/v2/checkins/#{checkin_id}/addpost")
    req = Net::HTTP::Post.new(url.path)
    params = { :url => "http://www.hashtagmom.com",
      :text => message,
      :oauth_token => user.foursquare_access_token,
      :v => "20120827" }
    req.set_form_data(params)
    http = Net::HTTP.new(url.host, url.port)
    http.use_ssl = true
    response = http.request(req)
end