TradeDoubler shareholders have until March 14 to tender their shares in favor of AOL's acquisition AOL has extended its offer to acquire online marketing company TradeDoubler, giving its shareholders until March 14 to tender their shares in favor of the deal.AOL’s Swedish subsidiary, AOLS Holdings, offered to acquire TradeDoubler in January for approximately $900 million.The deal has been recommended by TradeDoubler’s board of directors but must still be approved by its shareholders. TradeDoubler offers hosted tools to help companies manage online marketing and sales activities. If the acquisition goes through, the Swedish company will become a subsidiary of Advertising.com, which AOL bought in 2004, but it will continue to do business in Europe as a separate brand.AOL said TradeDoubler will help increase the number of marketing options for its advertisers and provide Web site publishers with more ways to generate revenue through advertising on their sites. Technology Industry