Research shows smartphone sensors leave trackable fingerprints

The actual paper is here and is an interesting read: http://synrg.csl.illinois.edu/papers/AccelPrint_NDSS14.pdf

Though really, regardless of how well the hardware sensor itself can be fingerprinted, one shouldn't share sensor data with channels you don't trust, as there's plenty of other opportunities to identify someone from the data and metadata involved when you share.