I've been finding these around my house for over a year, and now I've seen them in action. My hair was stuck to the top of the inside of an open cabinet, and the central organism (the only one I managed to photo in detail) was 'working' my hair; it was bending double at times.
As soon as I positioned the A4 plastic wallet underneath the 3 critters, the whole setup fell, just like it did when it once fell from my head!
I have a binocular beam microscope at home and there is no doubt that it's my hair they're using, and I have samples where other organisms are clinging to my hair and eating it. Also, the hair is definitely passing through the organisms.