Well most recently it was for a service for knife sharpening called knifeaid. You mail in your knives and they sharpen them for a flat fee, comparable to what I pay now to drive to a sharpener.
I can only assume cause I've posted stuff about me cooking and have searched knife sharpening in the past. Not that hard to target really.
Going off on a bit of a tangent, but some time ago I bought a sharpening stone for $30. It takes about 10 minutes start to finish from dull blade to sharp blade, which is a lot more convenient than going to the knife sharpener or mailing your knives. I also use it to sharpen my hair clipper blades once a year.
I'm actually very handy with a whetstone, however I'd contest the 10 minutes part, and as much I use mine its a non trivial amount of work. Professional sharpening is just way better in my situation
Completely agreed on this. I've also used a sharpening stone to sharpen scissors. It's quick, easy, and really satisfying seeing a dull blade go to razor sharp with a few minutes of work.
I can only assume cause I've posted stuff about me cooking and have searched knife sharpening in the past. Not that hard to target really.