Yahoo Mail, MySpace Garner Half of Online Ad Impressions

Email properties accounted for 49 percent of online ad impressions in May, slightly more than April's 48.7 percent, according to Nielsen/NetRatings AdRelevance, reports MediaPost (via MarketingVOX). Yahoo Mail's share of May's total ad impressions was a whopping 38 percent, followed by MSN Hotmail at 8.6 percent. General community sites accounted for 16.3 percent of online ad impressions in May, compared with 16.1 percent last month; MySpace alone accounted for 14.6 percent of all online ad impressions for the month.