Demand Media, the Santa Monica-based social and domain name media firm, has raised another $35 million in its fourth round of funding, according to SEC filings picked up by PEHub. The company recently bought social media tools firm Pluck, for about $67 million, as we reported earlier this month.

Demand raised $100 million for the fourth round last year and this is new money into the round. For the $100 million, investors included Goldman Sachs, 3i Group, Generation Partners, Oak Investment Partners and Spectrum Equity Investors. No word on who invested in this $35 million raise.

The company has now raised $355 million since being launched in March 2006, including earlier rounds of $120 million and $100 million. It was founded by CEO Richard Rosenblatt, former head of MySpace parent company Intermix Media.

Disclaimer: Pluck is a sponsor of our EconSM conference.

• Demand Media Buying Pluck, For About $67 Million
• Demand Media Adds $100 Million More Funding; Total Comes To $320 Million