Twitter has redoubled its effort and commitment to fighting spam on the micro-blogging site by filing a lawsuit in the San Francisco federal court. The lawsuit names 5 of the most prolific spam tool providers, and the people that use them to flood the service with junk messages. The suit alleges that the people have broken the site's rules banning spam.

The 5 named are TweetAttacks, TweetAdder, TweetBuddy, James Lucero and Garland Harris. The total cost of combating these spammers? The suit says Twitter incurred bills of at least $700,000, with an incredible $300,000 of that dedicated to TweetBuddy alone. It's not clear just how much spam Twitter removes each day, but they do say that they now process an incredible 350 million tweets a day from 140 million active users.

"With this suit, we're going straight to the source," the company wrote on their blog yesterday. "By shutting down tool providers, we will prevent other spammers from having these services at their disposal. Further, we hope the suit acts as a deterrent to other spammers, demonstrating the strength of our commitment to keep them off Twitter."