Multiple tweets using PHP and TwitterOAuth

i'm looking for a way to tweet messages (maximum of 10) using 4 different accounts. I was able to do so using abraham's class, but after a few 开发者_JAVA技巧tweets, i keep getting 403 status codes. Any ideas?

There is a limit to the number of tweets you can make per hour. How many you can make depends on how you are using the API. See http://support.twitter.com/entries/160385-how-do-i-get-whitelisted