The claim is made implicitly by Classified Intelligence, a marketing firm that aims to specialise in offering classifieds solutions to businesses.
According to the CNet coverage:
Local search advertising revenue is expected to reach $502 million in 2004, up from $408 million last year, according to market researcher Jupiter Research. That number is expected to hit $824 million by 2008.
Classified advertising represents a $28 billion to $30 billion business in the United States, including $16 billion in daily newspapers, and an estimated $100 billion business internationally.
Online auction giant eBay took a 25 percent stake in Craigslist in August.