[support] run cron + post tweet

Hi I am a newbie in drupal module developement, I have my website http://seydinet.com made with Managing News and now I just want create a module who if I run my cron post automaticly a tweet with a message telling for exemple "4news item added in seydinet.com" So I create a module directory name seydi, I add both file seydi.info and seydi.module. I have no problem with editing seydi.info but the big deal is with seydi.module. I start by implementing hook_cron() then I have to implement the code who gonna post the tweet and I dont know how to do that Here is the begining of my code

<?php /* implementation de hook_cron */

function seydi_cron(){ //watchdog('seydi', 'my module just add something in cron', array(), WATCHDOG_DEBUG); // db stuff if (date('G', time()) == '19'){ //tweet } }

Thanks