Everyone is obsessed with building communities online these days — whether it’s a Web 2.0 hotshot or companies like Dell and Starbucks. Tina Sharkey has as much experience as anyone. …

BabyCenter may be one of the largest parenting Web properties in the world, but it’s only a small part of its huge corporate parent, Johnson & Johnson. It’s the only media site the company owns, and with the launch of a BabyCenter social network, it s