Twitter brought the malware-fighting startup Dasient into its team today.

"Effective immediately, we will be bringing our technology, tools, and team to the revenue engineering team at Twitter," Dasient wrote on its blog.

This company, which specializes in malware protection and Web security, launched its Web anti-malware platform in 2009. In 2010, it debuted the first anti-malvertising service to protect sites from "malicious ads."

"By joining Twitter, Dasient will be able to apply its technology and team to the world's largest real-time information network," Dasient wrote on its blog. "As part of this merger, Dasient is winding down its business and is no longer able to accept new customers."

Last year, Dasient reported that Web sites thought to be infected with malware had nearly doubled from the previous year and that malvertising is also quickly on the rise.