Great discussion on GRP standard for online video - Here is the opinion of Tim Avila from Brightroll, "GRP matters less online. It's an insufficient measure in a realm where ad effectiveness can be determined more directly. In fact, better accountability is a well-documented reason for online video s torrid spending growth. In an interactive medium where advertisers can measure lift in online sales, keyword searches and consumer attitudes in near real-time, aggregate measures like GRP become less important. As online video spending continues to grow, look for GRP to matter less, not more."