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(PR:164) Explain the nature of online advertisements
Yahoo! http://www.yahoo.com
Alta Vista http://www.altavista.com
MSN http://www.msn.com
Lycos http://www.lycos.com
Excite http://www.excite.com
AOL http://search.aol.com
HotBot http://hotbot.lycos.com
Iwon http://www.iwon.com
LookSmart http://www.looksmart.com