# File lib/twitter/client/friendship.rb, line 33
  def friend(action, value)
    raise ArgumentError, "Invalid friend action provided: #{action}" unless @@FRIEND_URIS.keys.member?(action)
    value = value.to_i unless value.is_a?(String)
    uri = "#{@@FRIEND_URIS[action]}/#{value}.json"
    response = rest_oauth_connect(:post, uri)
    bless_model(Twitter::User.unmarshal(response.body))
  end