comScore, Nielsen Battle Over Estimates: Not Users, But Advertisers 05/15/2015 | Concurrent Media
In a report sent to investors this morning, Wall Street analyst Brian Wieser says both companies’ claims of dominance are likely specious and irrelevant. Citing recent claims by comScore that 25 of the top 25 advertisers currently use its online audience ratings vs. Nielsen’s claim that 20 of the top 25 advertisers use its version,
