'Big Four' to Nab Two-Thirds of all 2007 Online Ad Revenue

Two-thirds of the $19.5 billion expected to be spent on internet advertising in 2007 will be placed with the four biggest web companies Google, Yahoo, AOL and MSN. Google will nab the largest share, with 32.1% of total ad spend, Yahoo is next with 18.7%, AOL follows with 9.1% and MSN is fourth at 6.8%.

That estimate -- that the Big Four will nab 66.6% of total ad spending this year -- is up from 57.4% in 2006 and 53.75% in 2005. Some of the share is attributed to search revenue, which will comprise 42.5% of online ad spending this year.