The top 10 brands advertising on the Internet are trying to reach narrow groups of consumers, not the mass market, according to New York-based AdZone Interactive . AdZone reported today that Wingspanbank.com was the biggest advertiser in May, spending an estimated $34 million. It was followed by Yahoo.com ($33.5 million), and advertising company Bonzai.com. ($31 million). Also in the top 10 were Amazon.com, Datek.com and HGTV.com.