text: AOL Shifts Strategy to Attract More Advertisers, Users (washingtonpost.com) washingtonpost.com - For years, America Online Inc. grew steadily into the nation's biggest Internet service by treating subscribers to exclusive content and services it hoped would produce the sort of captive audience that advertisers crave. But now, with users departing for faster or cheaper online competitors, company officials are re-thinking their "walled garden" strategy.