Changes

twitter = TwitterConnection.new()

at (interval) {

msg = fetch_external_resource;

twitter = TwitterConnection.new()

mentions = twitter->mentions( since_id => last_mention )

at (interval) {

foreach mention in mentions {

}

}

sub reply(mention) {

msg = fetch_external_resource()

msg = '@' + mention.sending_user->screen_name + ' ' + msg

msg.truncate_to_140_chars