Facebook video ad viewability rates are as low as 20 percent, agencies say

Facebook’s metrics woes may be far from over. After fessing up to a string of measurement errors over the past six months, the social media company has bowed to pressure from ad buyers and started letting third-party auditors check its numbers. Some agencies started using the new auditing capabilities a few months ago and have been stunned to see viewability rates on Facebook ...Read the full article