The Interactive Advertising Bureau’s “NewFronts” ad sales extravaganza officially kicked off today, with live and virtual sessions on the slate in the upcoming days following presentations Monday from Google and VIZIO. With story after story suggesting digital ad sales growth is relentless while linear sales action remains tepid, Guideline Solutions has released fresh data that shows the good ‘ol Upfront remains important for advertisers seeking adults 18-49, in particular.