AFAIK, Twitter's API rate limit is <i>per IP</i> + per user (i.e. you can do X api requests per user on each machine). Also, on a whitelisted IP you get 20K requests per <i>user</i>.<p>There was a long discussion about that a few months ago on the dev mailing list, whether this by purpose or mistake. Back then, the official response was that it's by purpose, but verify if that's true. If it is, you have plenty of API calls you can do per user.