NYC-based behavioral advertising firm Tacoda has raised $12 million in third round funding. The round was led by Rho Ventures, a new investor in the company.

The funding will enable the company to expand its behavioral ad network, launched in September 2005. The company says that in the past 90 days, the number of sites in the ad network has tripled to more than 3,000. The number of monthly unique visitors reached has jumped to 130 million from 85 million.

Till now the company has raised about $26 million.

I spoke to Tacoda CEO Dave Morgan yesterday on the general online advertising market and will post the interview later this week.