Media mogul Martha Stewart is launching an online social network for women -- joining other entrepreneurs who are starting similar projects and are collectively propelling social networks into the mainstream of the Internet, sources tell UPI's The Web. The movement is becoming so pervasive that other media companies, including Google.com, with its Google Co-Op, and Yahoo! with its purchase of Del.icio.us, are starting search engines specifically for online communities -- creating veritable miniature Internets within the global Internet.