(from eMarketer.com)
Social Networks Get Down to Business
AUGUST 18, 2008
Think of them as digital water coolers—surrounded by thousands of workers engaged in serious business conversations.
Do business and socializing mix?
Apparently so. As the number of business users of social
networks continues to increase, advertising expenditures will rise, too.
In the US this year, advertisers will spend $40 million to reach a business
audience on online social networks, and that is just the beginning. According
to eMarketer projections, that ad spending will reach $210 million in 2012.

(Read the Full Article at eMarketer.com)