EMarketer says that
advertising spending on U.S. blogs will increase to $746 million in 2012, from
$283 million in 2007. The U.S. blogosphere continues to morph into the
mainstream and more advertisers, agencies and ad networks are viewing blogs as a
viable medium to reach coveted demographic groups. Still, blog advertising is a small fraction of total online
spending. In 2007, blog advertising made up 1.3% of the online advertising pie,
and should peak at 1.8% in 2009 before declining to 1.5%
by 2012.