California's high-tech firms make the world's most popular smartphones, social networks and search engines, but there's one asset they're struggling to build: trust. The vast majority of Californians surveyed in a statewide poll are worried about the data collected by Internet and smartphone companies, and most said they distrust even firms known for their ardent fans and tens of millions of daily users. Many of those surveyed in the latest USC Dornsife/Times poll also said they were wary of firms collecting personal information without their knowledge and concerned that personal data could become public or be harvested to sell them...