A definition for "premium" digital advertising has proven elusive, but at least one ingredient is known: viewability. The vast majority of marketers (86%) are mandating a viewability threshold for their digital ad campaigns this year, and just over two-thirds (70%) are expressing a growing confidence in viewability. That's according to a new "Industry Pulse" report from Undertone. The company surveyed over 750 clients -- including brands, agencies and publishers -- for the report.

Good news, marketers! You have something in common with superheroes! You both have trouble dealing with malware, fraud and bots. Intel Security this week released its 2015 "Most Toxic Superheroes" list, which ranks superheroes based on how likely they are to lead Internet users to malicious Web sites. Aquaman checks in at No. 1, regaining the top spot he held in 2013.