Nexstar promotes Steven Blanchard to vice president-general manager of its broadcasting and digital operations in Richmond, including WRIC-TV and wric.com, plus their related digital and social media channels ... Plume, SaaS platform for communications service providers, hires Palo Alto Networks’ Valerie Buckingham as chief marketing officer and Adrian Fitzgerald, ex-Sandvine and Oracle, as chief revenue officer ... Machine learning company SiMa.ai taps Amazon Web Services’ Elizabeth Samara-Rubio, also former Accenture, as chief business officer ... Media analytics firm Toluna promotes Dixit Chanana to managing director of the India offices of Toluna and MetrixLab, the market research company that Toluna acquired in June; Ravi Radhakrishnan departs as MetrixLab India managing director.