Metrics related to Custom Viewability are not accredited by the Media Rating Council.
Metrics related to IVT Categories are not accredited by the Media Rating Council.
Impressions, Views and related metrics for Mobile ads are under audit by the Media Rating Council for accreditation at this time.
At February 2, 2017 comScore partially released a brand safety crawler upgrade aimed at deprecating our "affinity" crawler to begin the migration to our proprietary content classification engine. At February 3, 2017 the upgrade was rolled back due to unforeseen alerting changes. This change did not affect blocks or any other impression counts.
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