Answer:
What always goes to bed with his shoes on?
You heard me before, yet you hear me again, then I die. Until you call me again.
It is the electronic version of junk mail or a salty meat in a can.
I can run but not walk. Wherever I go, thought follows close behind.
What must be in the oven yet can not be baked? Grows in the heat yet shuns the light of day? What sinks in water but rises with air? Looks like skin but is fine as hair?
You use it between your head and your toes, the more it works the thinner it grows.