The San Francisco Chronicle reports that concern over children getting targeted by predators at social networking sites or being able to access inappropriate materials through search engines has led to increasing demand for laws that will create secure, child-friendly networks. This demand has prompted two moms to lead companies that focus on creating technologies that make web surfing safer for children. One called Industrious Kid will unveil a social networking site called Imbee.com, which is geared towards children 8-14. The other, Thinkronize, created the netTrekker search engine for K-12 students…