Twitter has acquired security startup Dasient, which describes itself as an anti-malware vendor for large enterprises in the financial services, media, and online sectors. Its technology will be housed within Twitter's revenue engineering team, which suggests its primary purpose will be to identify malicious ads submitted through the company's nascent self-serve ad platform before they go live.

In 2010, the company released a service that scanned for malicious ads - for instance the kind that forced downloads on unsuspecting users. The buyers of these ads often present themselves to publishers and ad networks as agency media buyers representing major brands. When the phony ads go live, bad guys can reach millions of victims at once on websites they ordinarily should trust.

"Over the last year, we have been very active in securing the ads and content of the some of the industry’s largest ad networks and web sites," the company said in a blog post yesterday. "By joining Twitter, Dasient will be able to apply its technology and team to the world's largest real-time information network."