The 23-year-old owner of IntenCity Global, a five-person marketing and public-relations firm in New York, holds court daily at her profile page, bantering with young fashionistas via postings on her page's public forum, or Wall, and steering them to parties she hosts for clients in the beauty and fashion industry.
MAKING FRIENDS

Hosting the parties generates new Facebook friends for Ms. Gruber -- about 1,200 -- and having more Facebook friends helps her generate bigger and better bashes for clients.