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Due to the difference of body shapes and motion patterns, each person can have specific influence patterns on surrounding WIFI signals while she moves indoors, generating a unique pattern on the CSI time series of the WIFI device," the team writes in its report. "FreeSense…is nonintrusive and privacy-preserving compared with existing methods [of human identification].

It sounds innocent enough. But users are growing suspicious of the app's whimsical, canned questions, many of which read like a marketing survey.