Fremont: California-based web-security startup Dasient has been acquired by Twitter to combat spam and malicious advertising. This is Twitter’s eighth acquisition since 2011. By joining Twitter, the company will be able to apply its technology and team to scale Twitter. The deal amount is still undisclosed.

As part of the merger, Dasient is winding down its business and is no longer able to accept new customers. The company’s staff will be working exclusively on Twitter’s revenue engineering team. Google Ventures, Radar Partners, Floodgate and Benhamou Global Ventures are the previous investors in the company.

Dasient was Co-Founded by three former Google staffers, Neil Daswani, Ameet Ranadive and Shariq Rizvi, in 2008 with the explicit goal to create and build a company that would make the web a safer place for online businesses.

According to the blog of Dasient, “The team is excited to announce that we have been acquired by Twitter. Effective immediately, we will be bringing out technology, tools and team to the revenue engineering team at Twitter.”

The company develops software that identifies and protects against web-based malware and malicious advertising, and even traces the link back to their source. In 2009, Dasient launched its web anti-malware platform, capable of scanning URLs and websites for the presence of harmful content. The next year, it launched the industry’s first anti-malvertising service to protect ad networks and publishers from the scourge of malicious ads.