A study released Tuesday by Consumer Reports found widespread concern about online privacy.
The survey found that 71 percent of consumers are "very concerned" about companies selling or sharing information about them.
Three out of four smartphone owners said they are very concerned that mobile applications can access their contacts, photos and location without their permission.
Most people also said they are very concerned about advertisers targeting kids with personalized ads, companies holding onto data even after they don't need it and online data being used to prevent someone from getting a job or a loan.
The study found 44 percent of consumers are very concerned about advertisers tracking their online activities and targeting them with ads. And 42 percent of the respondents said they are very concerned that privacy policies are too long and complicated.
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