AOL Shifts Strategy For years, America Online Inc. grew steadily  by treating subscribers to exclusive content  it hoped would produce the sort of captive audience that advertisers crave. But now, with users departing for online competitors, company officials are re-thinking their strategy. &lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2"\ color="#666666"&gt;&lt;B&gt;-The Washington Post&lt;/B&gt;&lt;/FONT&gt;