Yahoo is planning to buy an online advertising network BlueLithium for US$300 million with cash before the end of the year. This is the move of Yahoo in order to regain their profit that lost during the past few years to its competitor Google. Yahoo deficit nearly 7% to US$303 million during the first half of 2007. However, its competitor Google made 47% to US$1.9 billion.

BlueLithium based in San Jose, California, operating a large ad network, serves up ads to 145 million visitors per month.

BlueLithium also provides “behavioral targeting” which is a type of tracking technology able to identify the Internet users’ interests, and show the relevant ads according to their interests.

BlueLithium has 10 offices in US and Europe with total workforce of 135. It is ranked No. among online ad networks in US. BlueLithium has been making money since 2004.