Leo Burnett Worldwide , Chicago , part of the Publicis Groupe , is opening what it calls an ideas hub on Second Life , a social Web site created by Linden Lab , San Francisco , in which the estimated 800,000 participants interact through virtual characters known as avatars .
Linden Lab /business/company/place_founded San Francisco
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Linden Lab
PERSON
San Francisco
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/business/company/place_founded