Career Mosaic, New York, has appointed Matthew Bass senior vice president and general manager. Bass was formerly vice president and general manager for the New York region of USWeb Utopia . . . Jennifer Friedberg has joined Nicholson NY as senior vice president, business development and marketing. Friedberg was formerly senior partner at OgilvyOne, New York . . . 24/7 Media, New York, has named Susan Storms vice president of northeastern regional sales and Angela Beristain director of business development. Storms was vice president of interactive ad sales at Yoyodyne Entertainment, Irvington, New York, and Beristain was a senior account executive at AOL/Digital City, San Francisco.