Answer:
It is the electronic version of junk mail or a salty meat in a can.
There are two meanings to me. With one I may need to be broken, with the other I hold on. My favorite characteristic is my charming dimple.
Half-way up the hill, I see you at last, lying beneath me with your sounds and sights. A city in the twilight, dim and vast, with smoking roofs, soft bells, and gleaming lights.
It can cause deflation of tires when dropped from the rear of spy cars.
I am the greatest teacher out of them all, but alas in the end I kill my pupils.
As round as an apple. As deep as a cup. All the king's horses can't pull it up.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?