The polynomially named online marketer [x + 1] has raised a $16 million funding led by Advanced Technology Ventures. Additional backers in the round included Hudson Venture Partners and Blue Chip Venture Company. The New York-based company plans to use the proceeds to improve its search optimization tools and “predictive marketing” offerings. The company has also sought to build up its senior management this year. In January, John Nardone, former co-president and chief client officer of Aegis Group’s Marketing Management Analytics unit, was brought in as CEO. Last month, another MMA alum, Paul Davis, took on the post of VP, analytics at [x + 1]. Release