Nexstar launched Stellar, a data-driven audience platform that lets advertisers buy digital and linear advertising. Stellar uses predictive technology to determine where a brand’s advertising will perform best and lets buyers create campaigns using Nexstar’s 199 TV stations, 120 local websites and 284 local news and weather apps.

Comscore revealed that it has invented what it calls the next generation of personification methodology created to bring person-level measurement to its video products.

Omnicom is expected to be one of the major ad companies taking part in a new “forum” to examine audience-tabulation issues. Other big agencies are expected to participate as well, as the media industry and Nielsen appear to move further apart in the debate over how TV viewers ought to be counted in a business that has moved full bore into digital realms.