Answer:
A hole in a pole, though I fill a hole in white. I'm used more by the day, and less by the night.
The higher I climb, the hotter I engage. I cannot escape from my crystal cage.
What asks but never answers?
What is put on a table, cut, but never eaten?
It is the electronic version of junk mail or a salty meat in a can.
You use it between your head and your toes, the more it works the thinner it grows.